Delphiniums, the majestic flowers of midsummer, are a beloved addition to any cottage garden. However, by July, many gardeners notice a decline in their once-vibrant blooms. Fear not, for with a few simple yet effective care tips, you can ensure these plants continue to flourish well into the late summer months. Here's an in-depth look at how to keep your delphiniums healthy and blooming beautifully.
The Art of Deadheading
Deadheading is a crucial task in July. As soon as the flower spikes start to fade, remove them promptly. This simple act can significantly impact the plant's health. By cutting back the spent spikes, you're essentially telling the plant to focus its energy on producing new flowers rather than seeds. Rachel Bull, Head of Gardens at Homes & Gardens, emphasizes the importance of this practice, stating, 'Deadheading is the most critical task for delphiniums in July. Many varieties will reward you with a second, lighter flush of flowers if you cut back the spent spikes before the plant starts putting energy into seed production.'
When deadheading, use sharp pruning shears to make clean cuts. This ensures that the stems are less likely to be damaged. If your delphiniums have reached their full height, it's also a good idea to check their supports while pruning. Grow-Through Plant Supports are excellent for keeping tall flower spikes upright during summer storms and strong winds.
Deep Watering for Healthy Roots
Delphiniums thrive in consistently moist soil, but they are not fans of prolonged drought. During heatwaves, deep watering is key. Aim to soak the soil once or twice a week, depending on rainfall and soil type. This ensures that the moisture reaches the deeper roots, helping the plants cope with rising daytime temperatures. Early morning watering is ideal, as it reduces evaporation and helps the plants retain moisture.
A Gilmour Heavy Duty Adjustable Metal Hose Nozzle is a handy tool for this task, allowing you to switch between a gentle shower for borders and a stronger stream for other yard jobs. Additionally, adding a layer of compost or organic mulch around the base of the plants can help conserve soil moisture and regulate root temperatures, reducing the need for frequent watering.
Support Systems for Stormy Days
July often brings intense thunderstorms, and tall delphinium flower spikes are vulnerable to strong winds and heavy rain. It's essential to check and reinforce your plant supports during this time. Soft twine, bamboo canes, or grow-through plant supports are excellent options, ensuring the stems have enough room to move naturally without rubbing. Ecostakes Bamboo Garden Stakes from The Home Depot are a versatile and affordable choice for supporting tall delphiniums.
Feeding for Fresh Growth
After deadheading, consider giving your delphiniums a light feed. A balanced fertilizer or one slightly higher in potassium is ideal, as it helps plants recover without encouraging excessive soft, leafy growth during hot weather. Miracle-Gro Water Soluble Bloom Booster Flower Food is a popular choice, providing the necessary nutrients for delphiniums as they recover from their first bloom cycle.
Watch Out for Powdery Mildew
Hot days followed by humid nights create the perfect conditions for powdery mildew, a common issue for delphiniums in midsummer. Good airflow is your best defense. Remove any badly affected leaves, avoid overhead watering, and ensure neighboring plants are not overcrowded. Safer Brand Insect Killing Soap is a gentle yet effective solution for tackling soft-bodied summer garden pests while being safe for ornamental plants.
Avoid Common Mistakes
The key to keeping delphiniums thriving is avoiding a few simple mistakes. Don't let plants dry out completely during hot spells, as drought stress can shorten flowering and reduce the chance of a second flush. Stay on top of deadheading to encourage fresh growth, and resist the urge to cut back healthy foliage too early, as it continues to feed the plant and store energy for next year's blooms.
By following these care tips, you can enjoy the beauty of delphiniums throughout the summer, ensuring they remain a standout feature in your garden.
