Annual Flowers Taller Than 24 Inches

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Lawn & Garden

©2007 Publications International, Ltd. View additional images of annual flowers.

Annual flowers are available in various sizes, shapes, and colors. If you want to create an impressive garden, consider planting tall annual flowers that are over 24 inches tall. You can plant them behind shorter flowers like lobelia to create a stunning backdrop or position them along a walkway or fence.

This page provides links to annual flowers that are taller than 24 inches and some that are usually shorter but have varieties that grow taller. Before purchasing the plants, consult your local garden center to ensure that they are suitable for your region.

Blue to Purple Annual Flowers Over 24 Inches in Height:

  • Perilla

Annual Grasses and Foliage Over 24 Inches in Height:

  • Perilla

Pink to Fuchsia Annual Flowers Over 24 Inches in Height:

  • Cleome, Spider Flower
  • Lavatera, Rose Mallow

Red Annual Flowers Over 24 Inches in Height:

  • Amaranthus, Summer Poinsettia

White to Green Annual Flowers Over 24 Inches in Height:

  • Amaranthus, Summer Poinsettia
  • Cleome, Spider Flower

Yellow to Orange Annual Flowers Over 24 Inches in Height:

  • Amaranthus, Summer Poinsettia
  • Sunflower

Annual Flowers 12 Inches to Over 24 Inches in Height:

  • Cosmos
  • Dahlia
  • Lisianthus, Prairie Gentian
  • Nicotiana, Flowering Tobacco

Annual Flowers Under 12 Inches to Over 24 Inches in Height:

  • Celosia
  • Coreopsis
  • Salvia, Scarlet Sage
  • Snapdragon
  • Zinnia

If you couldn’t find what you were looking for, you can try browsing through our pages on Annual Flowers, Annuals, or Perennials Over 24 Inches.

FAQ

1. What are annuals over 24 inches?

Annuals over 24 inches are flowering plants that grow to a height of 24 inches or more during one growing season. These plants complete their life cycle within a year, meaning they grow from seed, flower, set seed, and die in one season. Annuals over 24 inches are popular for their showy blooms and add an eye-catching display of color to gardens, borders, and containers.

2. What are some examples of annuals over 24 inches?

Some examples of annuals over 24 inches include sunflowers, cosmos, zinnias, cleomes, dahlias, and marigolds. These plants are available in a range of colors and sizes, making them a popular choice for gardeners who want to add height and vibrancy to their gardens.

3. How do I care for annuals over 24 inches?

Caring for annuals over 24 inches involves providing them with adequate sunlight, water, and nutrients. These plants prefer full sun and well-draining soil that is kept moist but not waterlogged. Regular fertilization with a balanced fertilizer can help promote healthy growth and flowering.

4. Can annuals over 24 inches be grown in containers?

Yes, annuals over 24 inches can be grown in containers, provided the containers are large enough to accommodate the plants’ root systems. These plants require a well-draining potting mix and regular watering to prevent the soil from drying out. Fertilizer should also be applied regularly to promote healthy growth and flowering.

5. Do annuals over 24 inches require staking?

Some annuals over 24 inches may require staking to prevent them from falling over or becoming damaged by wind or heavy rain. Plants such as sunflowers, dahlias, and cleomes are particularly prone to toppling over and may benefit from staking or support structures.

6. How do I propagate annuals over 24 inches?

Annuals over 24 inches can be propagated by seed or by taking stem cuttings. To propagate by seed, collect the seed heads when the flowers have finished blooming and allow them to dry out. Sow the seeds in a well-draining soil mix and keep them moist until they germinate. To propagate by stem cuttings, take a cutting from a healthy plant and root it in a well-draining soil mix.

7. When should I plant annuals over 24 inches?

The best time to plant annuals over 24 inches depends on the specific plant and the growing region. In general, these plants should be planted after the last frost date in spring and before the first frost date in fall. This ensures that the plants have enough time to grow and flower before the colder weather sets in.

8. Can annuals over 24 inches be used as cut flowers?

Yes, many annuals over 24 inches make excellent cut flowers and can be used to create beautiful floral arrangements. Plants such as sunflowers, zinnias, and dahlias are particularly popular for their long stems and vibrant blooms.

9. How do I deadhead annuals over 24 inches?

To deadhead annuals over 24 inches, simply remove the spent flowers as soon as they start to fade. This encourages the plant to produce more blooms and prolongs the flowering season. Deadheading can be done by pinching off the flowers with your fingers or by using a pair of pruning shears.

10. Do annuals over 24 inches attract pollinators?

Yes, many annuals over 24 inches attract pollinators such as bees, butterflies, and hummingbirds. These plants provide a source of nectar and pollen for these important insects and birds, which in turn helps to promote a healthy ecosystem.

11. Are annuals over 24 inches invasive?

Annuals over 24 inches are generally not considered invasive, as they complete their life cycle within one growing season and do not spread aggressively. However, some plants may self-seed and naturalize in certain conditions, so it is important to monitor their growth and remove any unwanted seedlings.

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