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Trumpet vines (Campsis radicans) are vibrant, fast-growing climbing plants known for their striking, trumpet-shaped flowers. To keep them healthy and blooming profusely, a well-planned fertilization schedule is essential. This guide provides a seasonal fertilization schedule tailored for thriving trumpet vines.
Spring Fertilization
As new growth begins, it’s important to provide nutrients that promote vigorous development. Apply a balanced fertilizer with equal parts nitrogen, phosphorus, and potassium, such as 10-10-10. Use about 1 pound per 100 square feet of soil around the base of the vine.
Spread the fertilizer evenly and water thoroughly to help nutrients penetrate the soil. This encourages healthy leaf and stem growth, setting the stage for a spectacular flowering season.
Early Summer Fertilization
During early summer, trumpet vines are actively growing and preparing to bloom. Continue with a balanced fertilizer, but consider switching to a formula slightly higher in phosphorus, such as 10-20-10, to promote flower production.
Apply fertilizer every 4 to 6 weeks. Ensure the soil remains moist and well-drained to prevent root rot and encourage healthy flowering.
Mid to Late Summer Fertilization
As the flowering period peaks, reduce fertilization frequency. Use a low-nitrogen fertilizer, such as 5-10-10, to encourage flower development rather than excessive leafy growth.
Applying fertilizer every 6 to 8 weeks is sufficient. Be cautious not to over-fertilize, as this can lead to lush foliage with fewer flowers.
Fall Fertilization
In fall, trumpet vines enter a period of dormancy. Reduce fertilization to once a month with a fertilizer low in nitrogen, such as 5-5-10, to support root health and prepare the plant for winter.
Stop fertilizing when the plant shows signs of dormancy, typically after the first frost. Avoid fertilizing late in the season to prevent new growth that could be damaged by cold weather.
Additional Tips for Healthy Trumpet Vines
- Ensure the soil is well-drained to prevent waterlogging.
- Water deeply after fertilizing to help nutrients reach the roots.
- Prune in late winter or early spring to shape the vine and remove dead or damaged growth.
- Mulch around the base to conserve moisture and regulate soil temperature.
- Avoid over-fertilizing, which can lead to excessive foliage and fewer flowers.
Following this seasonal fertilization schedule will help your trumpet vine flourish, producing abundant, vibrant blooms throughout the growing season. Proper nutrition combined with good cultural practices ensures a healthy, beautiful vine year after year.