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Dividing perennial plants is a fantastic way to rejuvenate your garden, increase plant stock, and promote healthy growth. July, especially in Zone 6 gardens, offers an ideal window for dividing certain perennials. Proper timing and technique can ensure your plants thrive after division. Here are the top seven perennials to consider dividing in July.
1. Hostas
Hostas are shade-loving perennials that form large clumps over time. Dividing them in July helps maintain their vigor and prevents overcrowding. Use a sharp spade or knife to split the clumps into smaller sections, each with roots and shoots. Replant immediately at the same depth and water well.
2. Daylilies
Daylilies are resilient and easy to divide. In July, their fans can be divided to encourage more blooms and prevent overcrowding. Carefully dig around the clump, lift it, and separate the roots with a knife or garden fork. Replant the divisions at the same depth, and they will quickly establish new growth.
3. Sedum (Stonecrop)
Sedum varieties, such as ‘Autumn Joy,’ benefit from division in mid-summer. Their thick, succulent stems are easy to divide. Use a garden fork or sharp spade to lift the plant, then cut into sections. Replant the divisions in well-drained soil to promote healthy root development.
4. Peony
Peonies are best divided in late summer, and July is an ideal time in Zone 6. Carefully dig around the plant, lift the root ball, and cut into sections with at least three to five eyes (buds). Replant each division at the same depth, ensuring good drainage and ample space for growth.
5. Iris
Bearded irises are easy to divide in July. After the flowering period, lift the rhizomes, cut into sections with healthy fans, and replant. Space the divisions adequately to prevent overcrowding and promote flowering.
6. Coneflower (Echinacea)
Coneflowers can be divided in mid-summer to rejuvenate their growth. Carefully dig up the clump, separate the root system into sections, and replant. Ensure each division has healthy roots and a few leaves, and water thoroughly after planting.
7. Shasta Daisy
Shasta daisies thrive when divided in July. Lift the entire plant, gently separate the clumps, and replant the divisions at the same depth. Proper spacing and watering will help establish vigorous new growth.
Tips for Successful Division
- Choose healthy, mature plants for division.
- Use sharp tools to minimize root damage.
- Replant divisions promptly to reduce stress.
- Water thoroughly after planting.
- Apply mulch to retain moisture and suppress weeds.
By dividing these perennials in July, you can enjoy a more vibrant, healthy garden in the years to come. Happy gardening!