Image added by Joey Williamson, HGIC Extension Agent, Clemson University, 06/13. Prepared by Karen Russ, HGIC Horticulture Specialist & Bob Polomski, Extension Consumer Horticulturist, Clemson University. (New 06/99.)
Hanging baskets or window boxes full of flowers or foliage plants give a color boost to your house and garden. They can be used effectively even in a very small space. If you choose plants carefully, you can change the plantings to suit every season.
Window Box with Begonia, Coleus and Petunia.
Joey Williamson, ©2010 HGIC, Clemson Extension
A lightweight potting mix is needed for container gardening. Soilless planting mixes provide excellent drainage, aeration and water-holding capacity that ordinary garden soil can not supply.
Be sure that your basket or window box has drainage holes. Drainage is essential so that the planting mix will not become water-logged. Do not place pebbles or other material at the bottom of the container. They will not provide better drainage.
Plastic or wire baskets are available. Both have advantages and disadvantages. Plastic is inexpensive, easy to plant and is slower to dry out. Wire baskets allow more choices in size and planting arrangements. Many people find them more attractive. Window boxes are usually plastic, wood or long wire baskets called hayracks.
Liners are used in wire hanging baskets to hold the soil and plants in position. Liners can be made of dried sphagnum moss or coconut fiber known as coir.
Window boxes and baskets call for a strong support system. Remember that the containers will be much heavier when watered.
Choose small, healthy young plants for planting. They will adapt to new surroundings much faster than older plants.
Plant much closer in a box or basket than you would in a flowerbed. Include plants with a variety of colors, shapes and textures. Trailing plants should be planted at the edges and bushy or upright plants will go at the center or back. Be sure that the taller plants will not block your windows or interfere with hanging the basket.
Site selection is as important for baskets and boxes as it is for any other plant. Remember that most of the time the hanging basket will be viewed from below. Hang the basket so that it will be close to eye level so that it can be admired and watered easily. Window boxes should extend the entire width of the window for best appearance.
Use your imagination in selecting plants. Many types of plants will grow in containers including annuals, vines, tropical plants, herbs and even some vegetables. For hanging salads, grow leaf lettuce, parsley and miniature tomatoes. Herbs thrive in containers and require little care. Thyme, oregano and rosemary are good for containers because they like the soil to dry out between waterings. Many plants normally grown as houseplants will be great for foliage in outdoor containers also.
Containers can dry out very quickly. Daily or even twice-daily watering may be necessary. Feel the soil to determine whether or not it is damp. If the potting mix feels dry 1 inch below the surface, it is time to water. Apply water until it runs out the drainage holes. If the pot dries out too much you should immerse it in water to resoak the soil mix. Containers will need frequent checking as the plants grow and temperatures become hotter.
Watering wands are good tools for difficult-to-reach baskets and window boxes. They extend your reach and produce a gentle shower.
Frequent watering flushes nutrients from the soil quickly, so frequent fertilizing is also necessary. Liquid fertilizers or timed-release fertilizers are the easiest methods of application. Time-release fertilizer pellets can be mixed into the soil at planting or worked into the top inch later. The soil in the container should be moist when fertilizer is applied, even liquid fertilizer. Feed baskets and boxes every two weeks from spring through summer with a complete liquid fertilizer diluted to half-strength.
Remove flowers as they fade to keep flowering baskets blooming well. Many plants are rejuvenated by a trim in late summer.
|Height & Width||Ornamental Features||Bloom Season||Comment|
|1 foot tall and wide||Green and white, pink, red or purple foliage.||Foliage color in winter||Plant in fall for color after frost.|
|1 to 2½ feet tall and wide||Fruit range in color from yellow to orange or red and purple to near black.||Midsummer to frost||The fruit of ornamental peppers are edible but extremely hot.|
|6 to 24 inches tall||White, pink, rose, lavender, purple, red or salmon.||Early summer to frost||Very heat and drought tolerant.|
|1 to 3 feet tall and wide||Colorful foliage often with lobed or cut margins.||Remove flowers for best foliage||Select sun-tolerant cultivars.|
|6 inches tall and at least 2 feet wide||Tiny, golden, daisy-like flowers.||Summer to frost||Not suited for coastal climate. Great in hot, dry areas.|
|Climbs or trails up to 10 feet.||Tiny brilliant red flowers above delicate fern-like foliage.||Summer to frost||Very tough despite delicate appearance.|
|6 to 12 inches tall and wide||Soft, finely cut whitish-silver leaves.||Foliage color from spring until frost||Excellent foliage contrast.|
(Erysimum or Cheiranthus species)
|6 to 24 inches tall and wide||Cream, yellow, orange, purple and maroon.||Spring to early summer||Plant in the fall for spring flowering.|
|6 to 18 inches tall and wide||Yellow, gold, orange and mahogany red.||Late spring to frost||Remove spent flowers for continued bloom.|
|6 to 12 inches tall and wide||Daisy-like yellow, orange, pink or red flowers.||All summer||Good choice for hot, dry locations.|
(Pelargonium x hortorum)
|12 to 36 inches tall and wide||White to pink, salmon or red flowers. Many cultivars have variegated leaves.||All summer||Remove spent flowers for continued bloom.|
|12 to 36 inches tall and wide||Scented purple or lavender blooms in clusters.||All summer||The species is more sweetly scented and larger than modern cultivars.|
|1 foot tall by 3 to 4 feet wide||Colors range from white to pink, salmon and red.
Branches trail like vines.
|All summer||Best with some afternoon shade.|
|Vines up to 6 feet, bush types 1 to 2 feet tall||Fragrant, colorful flowers. Bush types are suitable for window boxes.||Spring||Sweet Peas grow best under cool conditions. Plant in late winter for early spring bloom. Plant at Christmas on the coast.|
|6 to 12 inches tall, 3 to 4 feet wide||Trailing plant with fuzzy round leaves that are silver gray, variegated or lime green.||Foliage color all summer||Used as contrasting foliage. Very tolerant of hot, dry weather.|
|4 to 8 inches tall by 1 foot wide||Honey-scented flowers are white, pink, rose or purple.||Late spring until frost||Alyssum may decline in midsummer. Shear, feed and water to rejuvenate.|
|6 to 8 inches tall by 3 to 4 feet wide||Feathery foliage on gray trailing vines followed by bright red flowers||Late summer||Likes hot, dry weather.|
|4 to 12 inches tall by 24 to 48 inches wide||Virtually all colors are available.||All summer||Require ample moisture and fertility to thrive. Trailing cultivars are excellent in baskets.|
|6 to 9 inches tall by 12 to 18 inches wide||Wide variety of colors in single and double flowers.||All summer until frost||Thrives in hot, dry locations. New hybrid types stay open longer.
|6 inches tall by 4 feet wide||Blue or white flowers on long trailing branches.||Prolific from spring until frost||Very heat and drought tolerant.|
|6 to 12 inches tall by 3 to 4 feet wide||Lavender or white flowers on trailing stems.||All summer||Tolerates hot, dry windy conditions.|
(Vinca major ‘Variegata’)
|6 inches tall by 3 to 4 feet wide||White-edged or lime-centered green leaves on trailing stems.||Blue flowers, spring; grown for foliage||Excellent foliage contrast.|
(Verbena x hybrida)
|6 to 12 inches tall, 12 to 24 inches wide||Red, purple, pink and white flowers on bushy or spreading plants.||Mid spring until frost||Thrives in hot weather.|
|Height & Width||Ornamental Features||Bloom Season||Comment|
(Viola x wittrockiana)
|6 to 8 inches tall and wide||Available in nearly all colors of the rainbow.||Fall through spring||Plant in the fall. Blooms through winter. Peak bloom in spring.|
|6 to 36 inches tall and wide||Almost all colors except blue are available.||Continuous flowering from spring until fall||Keep constantly moist.|
|10 inches tall and wide||Large purple leaves and white or pink flowers.||Spring||Grown for its foliage.|
(Begonia x tuberhybrida)
|12 to 18 inches tall and wide||Large flowers in red, pink, orange, yellow, white and in bicolors.||Spring through summer||Lift tubers in fall and store; replant in spring.|
(Caladium x hortulanum)
|12 to 30 inches tall and wide||Arrow-shaped leaves patterned in red, pink, white and green.||Grown for colorful summer foliage||Keep evenly moist, fertilize frequently.|
|1 to 3 feet tall and wide||Leaf color mixtures include magenta, red, copper, orange, yellow, chartreuse and green.||Pinch off flower spikes||Most cultivars grow best in shade or part shade.|
|Polka Dot Plant
|12 to 18 inches tall and wide||Pink or white speckles on green leaves.||Grown for summer foliage||Beautiful foliage with white or pink flowers. Very tough.|
|2 to 3 foot wide trailing||Drooping tear-shaped buds open to flouncy interiors Flowers in red, pink, purple, coral, white and combinations.||Spring through summer||Keep evenly moist. Flowering will slow in heat.|
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This information is supplied with the understanding that no discrimination is intended and no endorsement by the Clemson University Cooperative Extension Service is implied. All recommendations are for South Carolina conditions and may not apply to other areas. Use pesticides only according to the directions on the label. All recommendations for pesticide use are for South Carolina only and were legal at the time of publication, but the status of registration and use patterns are subject to change by action of state and federal regulatory agencies. Follow all directions, precautions and restrictions that are listed.