Phlox, known for their vibrant colors and delightful fragrance, are a favorite among gardeners in New Hampshire. These perennials add cheer to any garden from mid-summer through fall. With the right conditions and care, you can cultivate glorious phlox plants that will thrive in your garden for years. This article outlines essential tips on how to grow phlox successfully in New Hampshire.
Before diving into the growing process, it’s essential to understand the different varieties of phlox. The two main types commonly grown are:
Garden Phlox (Phlox paniculata): This variety is characterized by its tall stems and large clusters of flowers. Garden phlox can grow up to 4 feet tall and generally comes in shades of pink, purple, red, and white. They are highly fragrant and attract butterflies and hummingbirds.
Creeping Phlox (Phlox subulata): Also known as moss phlox or ground phlox, this variety is shorter, typically reaching heights of 6-12 inches. It forms a dense mat that is perfect for rock gardens or as a ground cover. Creeping phlox blooms in early spring and comes in colors such as blue, pink, purple, and white.
Choosing the right type of phlox for your garden depends on the landscape you envision and the existing conditions of your garden.
New Hampshire’s climate presents unique challenges and opportunities for growing phlox. The state experiences cold winters and warm summers, making it essential to choose hardy varieties that can withstand these temperature fluctuations. Luckily, both garden and creeping phlox thrive in USDA Hardiness Zones 3 to 8, which encompasses all of New Hampshire.
Phlox prefers well-drained soil rich in organic matter. A pH level between 6.0 and 7.0 is ideal. To improve soil quality:
Phlox thrives in full sun but can also tolerate partial shade. However, they tend to bloom more profusely and develop stronger stems when planted in full sun (at least 6 hours of direct sunlight daily). When selecting a planting site, consider areas that receive ample sunlight throughout the day.
The best time to plant phlox in New Hampshire is during spring after the last frost date or in early fall before temperatures drop significantly (typically late April to early June or late August to early September).
Select Healthy Plants: Purchase healthy phlox plants from a reputable nursery or garden center. Look for robust foliage and signs of healthy growth.
Prepare Your Site: Clear the area of weeds or debris. Loosen the soil with a garden fork or tiller to ensure good drainage.
Dig Holes: Dig holes that are about twice the width of the root ball of your phlox plant but no deeper than necessary.
Spacing: Space garden phlox plants 18-24 inches apart to allow for their growth, while creeping phlox should be spaced about 12 inches apart.
Planting: Place each plant into its hole at the same depth it was grown in its pot. Fill in around the roots with soil and gently pat down.
Watering: Water thoroughly after planting to help settle the soil around the roots.
Phlox requires consistent moisture, especially during dry spells; however, they do not like soggy conditions. Water deeply once a week if there is no rain, allowing the top inch of soil to dry out between watering sessions.
Feed your phlox with a balanced fertilizer in early spring as new growth begins and again mid-summer after blooming. A slow-release granular fertilizer works well; follow package instructions for application rates.
To encourage continued blooming and prevent self-seeding, deadhead spent flowers throughout the growing season. This practice not only promotes more blossoms but also maintains a tidy appearance.
While phlox is generally hardy, they can be susceptible to certain pests and diseases:
Powdery Mildew: This fungal disease is common with high humidity levels; ensure proper spacing for air circulation and avoid overhead watering. If powdery mildew appears, treat it with fungicides or organic solutions like baking soda mixed with water.
Aphids and Spider Mites: These pests can weaken plants; regularly check undersides of leaves for infestations. Use insecticidal soap or neem oil as needed for treatment.
As winter approaches, taking steps to protect your phlox will pay off when spring arrives:
Cut Back Foliage: After the first frost kills back foliage (usually late fall), cut back dead stems to about 6 inches above ground level.
Mulching: Apply a layer of mulch around the base of each plant to insulate roots against freezing temperatures while preventing weeds from taking hold.
If you wish to expand your collection without buying new plants, propagation is relatively easy:
Division: In early spring or fall, divide mature clumps every 3-4 years by carefully digging them up and separating them into smaller sections before replanting.
Cuttings: Softwood cuttings taken during late spring can also be rooted in moist potting soil under humidity until new roots develop.
Growing phlox in New Hampshire can be a rewarding experience that enhances your garden’s color palette and fragrance through summer into fall. By understanding their requirements for light, water, soil quality, and pest management while taking steps for winter protection, you can ensure these beautiful flowers flourish year after year.
With dedication and care, your efforts will yield stunning displays that invite admiration from neighbors and passersby alike! Whether you opt for garden or creeping phlox—or both—your New Hampshire garden will benefit from their vibrant presence within its landscape tapestry.