Until a couple of years ago, if you wanted to grow annual flowers, your choices were limited to geraniums, impatiens, marigolds and red salvia. But today, most greenhouses offer an eyecatching array of choices. Whether you’re planting a windowbox, lining your sidewalk, or spicing up your perennial garden, here’s the way to make the foremost of what’s available.
Strictly speaking, an annual plant is one that completes its growing cycle (grows from seed, flowers and produces seed) within the course of one season . In other words, annuals pack tons of living into a brief span of your time .
But beyond this easy definition, there’s a good wider range of plants that we treat as annuals. Some, like impatiens, heliotrope and tuberous begonias, are literally tender or “half-hardy” perennials that can’t survive even a light-weight frost. On the opposite hand, some annuals, like pansies and decorative cabbage, are extremely cold-hardy and may withstand freezing temperatures quite well.
One of the simplest things about annuals is their incredible diversity and flexibility . Using them allows you to compose really exciting combinations of color, form and texture which will last all season long. Colors range from bright midsummer favorites like zinnias and Mexican sunflowers, to the subtler pastel reminder stock or lavatera.
You can also select annuals for your garden supported characteristics aside from flower color. There are annuals that are tall, medium, short or climbing; ones that prefer either full sun or partial shade; and people with special virtues, like delightful fragrance (stock, mignonette, nicotiana) or attractive foliage (caladium, coleus, dusty miller).
Perennials Grown as Annuals
A tender perennial is one that won’t survive the winter in your climate. Many gardeners simply treat these plants as annuals, enjoying them for one season and letting them die within the fall. people move plants inside at the onset of cold weather: treating them as houseplants over the winter; taking cuttings and starting new plants, or just exhumating and storing a part of the plant (usually the roots or bulblike structures) indoors for replanting the subsequent year.
Examples of perennials that are commonly grown as annuals include the more tender flowering sages (Salvia coccinea, S. patens, S. splendens, etc.), verbenas, and hyssop (Agastache spp.). Geraniums and scented geraniums (Pelargonium spp.) are often grown outdoors either in beds or pots during the summer, then brought indoors at the top of the season: to bloom in pots, to store darkly for replanting, or to use as cuttings for brand spanking new plants. Petunias, coleus, and sweet-alyssum (Lobularia maritima) are other plants which will be overwintered in pots and replanted the subsequent year.
If you’ve got a sunspace or attached greenhouse that receives many winter sunlight and doesn’t get too cold in the dark , you would possibly try growing a number of the interesting “annuals” that in their native habitats are literally perennial shrubs and trees. for instance , if given year-round protection, fuschias grow rapidly, reach anywhere from 18 inches to 12 feet or more, and produce their beautiful pendulous blossoms in reminder red, purple, and white nearly all winter long. Brugmansia, or angel’s-trumpet, can grow to fifteen feet tall in greenhouse cultivation. Its trumpet-shaped flowers are fragrant and delightful , but don’t grow it within the house if you’ve got small children; the plants are extremely poisonous.
Flowering plants that grow from tender bulbs, like dahlias, gladioluses and cannas, are often planted as annual flowers in cutting gardens or mixed ornamental borders. They, too, are tender perennials, and most varieties won’t survive the winter outdoors in most of North America. However, it’s easy to obtain these bulbs at the top of the season and store them indoors for replanting the subsequent year.
Starting Annuals from Seed
Seeing all the annuals offered purchasable at nurseries and garden centers within the spring, you would possibly wonder who would attend all the difficulty of starting their own annuals from seed. there’s an economic advantage, of course. A $2 packet of seeds might grow four large flats of alyssum plants, which might be a savings of roughly $70 over buying the plants from a nursery.
An equally compelling reason for starting your own plants from seed is that even the simplest garden centers don’t carry the complete selection of worthy garden annuals. Most sell the favored bedding plants, but it are often hard to seek out old-fashioned annuals, like love-lies-bleeding (Amaranthus caudatus), four o’clocks (Mirabilis jalapa), or lavatera (Lavatera trimestris)?
Part of the rationale for this absence stems from economics (supply and demand) and part is thanks to the character of the plants themselves. Garden centers wish to sell six-packs of plants that are already in bloom; that way customers know what they’re getting, and know that the plants will probably continue blooming after they get them home and within the ground. Instant gratification.
Yet many fine annuals won’t start blooming in nursery six-packs. They’re either too tall, don’t wish to be transplanted, or simply won’t flower until they need been within the ground for a few of weeks. If you would like to experiment with the entire palette of annuals, eventually you’ll want to grow a number of your own plants from seed.
Many annuals are easy to seed directly into garden soil. Others are best started indoors under lights in late winter or early spring. Consult seed catalogs, seed packets or the book From Seed to Bloom by Eileen Powell for information on specific plants. Generally speaking, annuals fall under three main categories, which determine when and where you ought to sow their seeds. For all categories, an honest rule of thumb is to plant seeds at a depth of two or 3 times their diameter.
Some annuals are so good at fulfilling their mission in life—flowering and setting seeds—that they’re going to self-sow readily under the proper conditions and produce brand-new plants the subsequent year. Common annuals which will self-sow vigorously include ageratum, petunia, foxglove, annual larkspur, forget-me-not, calendula and wild or striped mallow (Malva sylvestris).
Hardy annuals: are often direct-sown within the garden as early within the spring because the soil is often worked. For an earlier start, sow them indoors in flats eight to 10 weeks before the last spring frost date, and transplant them to the garden a few months later, after hardening them off.
Some hardy annuals also can be direct-seeded within the fall, and these plants will flower much before plants seeded within the spring. When fall seeding, plant the seeds a touch deeper than you’d within the spring, and spread some mulch over the seedbed after the bottom has frozen.
Examples of hardy annuals include bachelor’s-buttons, calendula, spider flower (Cleome hasslerana), pinks (Dianthus spp.), larkspur, linaria, Shirley poppies (Papaver rhoeas), nigella (love-in-a-mist), scabiosa (pincushion flower), snapdragons, lavatera, annual baby’s-breath (Gypsophila elegans), heliotrope, stocks and sweet peas.
.Until a couple of years ago, if you wanted to grow annual flowers, your choices were limited to geraniums, impatiens, marigolds and red salvia. But today, most greenhouses offer an eyecatching array of choices. Whether you’re planting a windowbox, lining your sidewalk, or spicing up your perennial garden, here’s the way to make the foremost of what’s available.
Strictly speaking, an annual plant is one that completes its growing cycle (grows from seed, flowers and produces seed) within the course of one season . In other words, annuals pack tons of living into a brief span of your time .
But beyond this easy definition, there’s a good wider range of plants that we treat as annuals. Some, like impatiens, heliotrope and tuberous begonias, are literally tender or “half-hardy” perennials that can’t survive even a light-weight frost. On the opposite hand, some annuals, like pansies and decorative cabbage, are extremely cold-hardy and may withstand freezing temperatures quite well.
One of the simplest things about annuals is their incredible diversity and flexibility . Using them allows you to compose really exciting combinations of color, form and texture which will last all season long. Colors range from bright midsummer favorites like zinnias and Mexican sunflowers, to the subtler pastel reminder stock or lavatera.
You can also select annuals for your garden supported characteristics aside from flower color. There are annuals that are tall, medium, short or climbing; ones that prefer either full sun or partial shade; and people with special virtues, like delightful fragrance (stock, mignonette, nicotiana) or attractive foliage (caladium, coleus, dusty miller).
Perennials Grown as Annuals
A tender perennial is one that won’t survive the winter in your climate. Many gardeners simply treat these plants as annuals, enjoying them for one season and letting them die within the fall. people move plants inside at the onset of cold weather: treating them as houseplants over the winter; taking cuttings and starting new plants; or just exhumation and storing a part of the plant (usually the roots or bulblike structures) indoors for replanting the subsequent year.
Examples of perennials that are commonly grown as annuals include the more tender flowering sages (Salvia coccinea, S. patens, S. splendens, etc.), verbenas, and hyssop (Agastache spp.). Geraniums and scented geraniums (Pelargonium spp.) are often grown outdoors either in beds or pots during the summer, then brought indoors at the top of the season: to bloom in pots, to store darkly for replanting, or to use as cuttings for brand spanking new plants. Petunias, coleus, and sweet-alyssum (Lobularia maritima) are other plants which will be overwintered in pots and replanted the subsequent year.
If you’ve got a sunspace or attached greenhouse that receives many winter sunlight and doesn’t get too cold in the dark , you would possibly try growing a number of the interesting “annuals” that in their native habitats are literally perennial shrubs and trees. for instance , if given year-round protection, fuschias grow rapidly, reach anywhere from 18 inches to 12 feet or more, and produce their beautiful pendulous blossoms in reminder red, purple, and white nearly all winter long. Brugmansia, or angel’s-trumpet, can grow to fifteen feet tall in greenhouse cultivation. Its trumpet-shaped flowers are fragrant and delightful , but don’t grow it within the house if you’ve got small children; the plants are extremely poisonous.
Flowering plants that grow from tender bulbs, like dahlias, gladioluses and cannas, are often planted as annual flowers in cutting gardens or mixed ornamental borders. They, too, are tender perennials, and most varieties won’t survive the winter outdoors in most of North America. However, it’s easy to obtain these bulbs at the top of the season and store them indoors for replanting the subsequent year.
Starting Annuals from Seed
Seeing all the annuals offered purchasable at nurseries and garden centers within the spring, you would possibly wonder who would attend all the difficulty of starting their own annuals from seed. there’s an economic advantage, of course. A $2 packet of seeds might grow four large flats of alyssum plants, which might be a savings of roughly $70 over buying the plants from a nursery.
An equally compelling reason for starting your own plants from seed is that even the simplest garden centers don’t carry the complete selection of worthy garden annuals. Most sell the favored bedding plants, but it are often hard to seek out old-fashioned annuals, like love-lies-bleeding (Amaranthus caudatus), four o’clocks (Mirabilis jalapa), or lavatera (Lavatera trimestris)?
Part of the rationale for this absence stems from economics (supply and demand) and part is thanks to the character of the plants themselves. Garden centers wish to sell six-packs of plants that are already in bloom; that way customers know what they’re getting, and know that the plants will probably continue blooming after they get them home and within the ground. Instant gratification.
Yet many fine annuals won’t start blooming in nursery six-packs. They’re either too tall, don’t wish to be transplanted, or simply won’t flower until they need been within the ground for a few of weeks. If you would like to experiment with the entire palette of annuals, eventually you’ll want to grow a number of your own plants from seed.
Many annuals are easy to seed directly into garden soil. Others are best started indoors under lights in late winter or early spring. Consult seed catalogs, seed packets or the book From Seed to Bloom by Eileen Powell for information on specific plants. Generally speaking, annuals fall under three main categories, which determine when and where you ought to sow their seeds. For all categories, an honest rule of thumb is to plant seeds at a depth of two or 3 times their diameter.
Some annuals are so good at fulfilling their mission in life—flowering and setting seeds—that they’re going to self-sow readily under the proper conditions and produce brand-new plants the subsequent year. Common annuals which will self-sow vigorously include ageratum, petunia, foxglove, annual larkspur, forget-me-not, calendula and wild or striped mallow (Malva sylvestris).
Hardy annuals: are often direct-sown within the garden as early within the spring because the soil is often worked. For an earlier start, sow them indoors in flats eight to 10 weeks before the last spring frost date, and transplant them to the garden a few months later, after hardening them off.
Some hardy annuals also can be direct-seeded within the fall, and these plants will flower much before plants seeded within the spring. When fall seeding, plant the seeds a touch deeper than you’d within the spring, and spread some mulch over the seedbed after the bottom has frozen.
Examples of hardy annuals include bachelor’s-buttons, calendula, spider flower (Cleome hasslerana), pinks (Dianthus spp.), larkspur, linaria, Shirley poppies (Papaver rhoeas), nigella (love-in-a-mist), scabiosa (pincushion flower), snapdragons, lavatera, annual baby’s-breath (Gypsophila elegans), heliotrope, stocks and sweet peas.
Half-hardy annuals: These are often direct-sown outdoors after the threat of hard frost (temperatures below 25°F) is passed. Indoors, start seeds in flats six to eight weeks before the last spring frost date, and harden off the plants before transplanting them to the garden. Once they need to be hardened off, half-hardy annuals can withstand a light-weight frost.
Examples include statice, nicotiana, painted-tongue (Salpiglossis sinuata), China aster (Callistephus chinensis), and various sorts of salvias and chrysanthemums.
Tender annuals: Seed are often sown directly within the garden only in any case danger of frost is past. For an earlier start, sow seed indoors four to 6 weeks before the last spring frost date for your area. Examples include marigolds, morning glories, zinnias, sunflowers and tithonia (Mexican sunflower), cosmos, amaranth, ageratum, celosia and gomphrena (globe amaranth).
Propagating from Cuttings
Late summer or early fall is a perfect time to require cuttings from annuals like geraniums, coleus, and impatiens, potting them up for winter bloom indoors or carrying them over for the subsequent spring. the subsequent steps will help ensure success.
- Clip off any flowers or flower buds on the plant. this is often done to focus the plant’s energy into developing new roots on the stem cutting.
- Select healthy stem cuttings (preferably healthy growing tips or side shoots) that are 2 to six inches long. Strip off any bottom leaves where the stem is going to be inserted within the rooting medium (either potting soil or water). Dip the cut end of the stem into a rooting hormone powder to encourage rapid root growth.
- Insert the cutting in potting soil (not a soilless seed starting mix) and water the container. Cover the flat or pot with a transparent bag to make a moist, humid atmosphere. Don’t let the plant leaves touch the side of the bag because this may cause rot.
- New roots should develop in one to 3 weeks. To test, gently tug on the cutting. Pot up the new plants in 4- to 6-inch containers and exclude direct sunlight for 3 days. After this point, place the plants in a sunny location.
- An alternative method of rooting plants, like begonias, coleus, or geraniums, is to put the stem cuttings during a glass of water to develop roots. Change water every few days until plants develop roots, and add a touch of soil to the jar after new roots appear. Plant rooted cuttings in 4- to 6-inch containers crammed with potting soil.
- Once the new plant is well established, pinch off the stem tip to encourage fuller growth and more abundant flowers.
Growing and Care of Annuals
Soil preparation and planting: generally, annuals prefer well-drained soil with a pH between 6.3 and 6.7. Digging during a good quantity of sphagnum or compost will help to create up the soil’s organic matter and permit the plants’ roots to spread quickly and obtain off to an honest start.
Set out young plants at the recommended spacing, to stop them from crowding one another once they need grown and matured. If you’ve purchased plants in flats from a garden center, the plants will likely be somewhat potbound once you remove them from their cells or containers. Before placing them within the planting hole, gently break apart the basis mass; this encourages roots to spread quickly into the encompassing soil. Fertilize at planting time with an organic or slow-release fertilizer.
You need to concentrate as to if a specific plant is hardy, half-hardy or tender before deciding when to transplant it. Some nurseries sell plants with labels that identify hardiness; when unsure , put your annuals out in any case danger of frost has passed. Another crucial factor, of course, is whether or not a specific plant prefers sun or partial shade.
If you would like to carry plants in flats for quite a few of days reception , make certain to water them and keep them during a partly shady, protected spot, like a porch or under a tree. Don’t leave them during a garage or other structure where you store cars or gasoline-powered machines; ethylene gas can cause flower damage and leaf drop. the simplest advice is to transplant annuals to the garden as soon as possible after bringing them home.
Care of annuals: Once they begin blooming, most annuals will flower all season long, until cold temperatures or frost put an end to their display. However, to stay them flowering and searching good, you’ll got to perform some simple but easy maintenance.
Deadheading is that the most vital task, and it involves pinching off old flowers even as they start to fade. the rationale for doing this is often simple. Annuals live to flower quickly, produce seed and die. goodbye as you retain deadheading blossoms, the plants will still produce flowers; once you stop, the plants will reduce or stop flowering, and put their energy into maturing seeds. Pinching off spent blooms is quick and straightforward , and it ensures season-long bloom.
If you’ve fertilized at planting time as recommended with an granular, organic, slow-release fertilizer, you shouldn’t need to fertilize annuals again during the season. With annuals, the flowers are the thing, and overfertilizing can cause lush foliage growth, which is basically beside the purpose . the first exception is container-grown plants, which usually got to be fertilized with water-soluble fertilizer every few weeks to take care of a colourful show.
Annuals have shallow root systems then require a daily supply of water. Avoid overhead watering if possible, which may stain some sorts of flowers (such as petunias), and make them look unattractive. It can also contribute to a buildup of botrytis fungus, which may affect plants like zinnias, geraniums, and marigolds. For best results, use a soaker hose or a drip irrigation system, or direct your watering pot right at soil level.
Designing With Annuals
Because they only stay in the garden for one season, annuals offer maximum flexibility. If you don’t like the effect you’ve created one year, you can simply chalk it up to experience and try again next year, without having to move plants around as you would with perennial plants.
The most popular and widely grown annuals are used as bedding plants—combinations of brightly colored flowers and foliage plants in a bed that is accessible from all sides for visibility and ease of maintenance. Such formal plantings can be especially effective if you plant a solid block of plants of the same variety and color. Separated by neat strips of lawn, such single-color plantings lend a nice formal effect to the garden.
An even more impressive sight is a massed single-color planting divided down the center by a band composed of a flower that has a different, but complementary, color or growing habit. For instance, a dark, vivid color, such as the bluish purple flowers of border lobelia (Lobelia erinus), might combine well with the white flower mounds of sweet alyssum (Lobularia maritima). Both plants are tender perennials grown as annuals, and both are similar in growing habit: low, mounding and normally used for edging beds.
Annuals work equally well in less formal designs, and they fill an important role by giving you a brilliant palette of color with which to work. They can be inserted into open spots between and around perennials and flowering shrubs. Adding annuals to a perennial border can bolster the effect of the whole, ensuring continuity of color and interest even when the perennials are not in bloom. They are great for creating rhythmic splashes of color, for linking different parts of the garden together, and for helping to carry a particular color theme through the garden during the entire growing season.
With all their different heights, colors and forms, it’s entirely possible to plant a spectacular border composed of annuals alone. Since most annuals flower at the same time, and over an extended season, you may want to choose varieties that will complement one another. You can strive to create a particular color scheme (pink, blue, and white; yellow, blue and orange), or simply go for a full-blown riot of color.
One way to create a more interesting and designerly effect is to include annuals that are grown for their attractive foliage, which can act as a foil for the bright blooms of other plants. The silver foliage of dusty miller (Senecio cineraria) is an old standby in the annual garden, but there are lots of other, lesser-known foliage plants as well, including cannas, which have tropical-looking, sometimes bronzed leaves; plectranthus, with its soft, silvery leaves; and perilla (Perilla frutescens), a beautiful herb whose dark purple, fringed leaves are particularly effective with white and pink-purple flowers.
Climbing annuals are another good choice, especially for cottage garden settings and containers (window boxes, hanging baskets, etc.). They have an old-fashioned, informal quality and will create a colorful living tapestry on fences, screens, trellises, or other supports. Plenty of people grow morning glories (Ipomoea purpurea and I. tricolor) and their close relatives, moonflower (I. alba) and cardinal climber (I. x multifida). But that scarcely scratches the surface of great climbers..
Containers and Overwintering
The perfect choice for growing in containers, annuals work well either alone or in combined plantings. Be imaginative when selecting containers, and if you have the room and the resources, don’t just stick to the tried-and-true terra-cotta pots. Windowboxes are designed for annuals, especially ones that cascade over the sides. The same holds true for hanging containers, where trailing varieties, such as the old-fashioned nasturtium Empress of India’, hang down and make a pretty display.
Impatiens are particularly beautiful when planted in a container set in filtered shade. Most commonly you’ll see them planted in the round, usually in a large container like a half whiskey barrel. To set your display apart, try experimenting with something a little different. An old soapstone sink would make an excellent bed for impatiens or other colorful annuals, as would a planter you’ve either bought or made from hypertufa (a kind of artificial stone). Brown fiber pots and planters are widely available, and will last for several seasons. They’re also light (at least when empty) and easy to move.
When planting in containers, make sure that you allow for adequate drainage. If the pot or container doesn’t have drainage holes, either insert a smaller container that does inside of it, or cover the bottom of the container with a layer of small stones or foam peanuts (a terrific way to recycle them).
Like other plants grown in containers, annuals require regular watering and fertilization throughout the growing season. In addition, you’ll also have to deadhead spent blossoms. During hot, dry weather, your plants may need watering once or even twice a day. Certain plants, such as moss rose (Portulaca grandiflora) and calliopsis (Coreopsis tinctoria), prefer somewhat dry soil and hot, sunny weather.
Tender annuals should be protected from early frosts. A stretch of warm fall days often follows the first frosts, so it pays to cover your plants and prolong the season. Once cool weather becomes the norm and frost kills off your plants, remove them from their pots and clean the containers with soap and water or a dilute bleach solution, to get them ready for next year.
The end of the growing season doesn’t necessarily mean the end of your annuals. Tender perennial plants already growing in containers can be cut back and brought indoors, while bedding plants such as petunias, impatiens, lantana and geraniums can be potted up and treated to a prolonged season of bloom inside.
Before bringing these plants indoors, check them for insect or disease problems and either treat them or discard them if you find any. Cut back the plants by 4 to 6 inches, and place the pots in a room that gets a lot of light. A greenhouse or sunspace is ideal, but so are sunny windows with a west or south exposure. After cutting back the plants, give them a dose of liquid plant food and they should soon start to develop new leaves and flowers.
Keep a close eye on any plants you bring indoors, at least for the first couple of weeks. The shock of being moved inside makes plants very vulnerable until they become acclimated to their new growing conditions. Pamper your plants as much as you can at this time to ease their transition to indoor life.
Some plants can be dug up in the fall, pruned way back, and stored in a cool, dark place until early spring. This includes most of the tender perennials, such as brugmansia, datura and geraniums. Water plants sparingly during this time.
Another strategy for overwintering plants is to take cuttings in the summer or early fall and start new plants from your old annuals. This technique works particularly well with coleus, plectranthus, and licorice plant (Helichrysum petiolate).