Pay attention: Cut back these top 12 perennials in June (Page 3 ) | June 18, 2025
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7. Geranium: Stimulate Fresh Growth
Hardy geraniums, with their delicate flowers and lush foliage, benefit from a mid-season trim. After the initial bloom period, cutting back the plant by about one-third can stimulate fresh growth and potentially a second round of blooms.
This practice also helps manage the plant’s size and encourages a more compact growth habit. By removing spent flowers and leggy stems, gardeners can keep geraniums looking their best throughout the summer.
8. Delphinium: Prepare for a Second Show
Delphiniums are known for their tall, striking flower spikes. After the first bloom, cutting back the flower stalks to the base can encourage a second, albeit smaller, flowering later in the season. This not only extends the blooming period but also helps maintain the plant’s health.
Pruning Delphiniums in June also prevents the plant from expending energy on seed production, redirecting it towards new growth and blooms. Additionally, cutting back spent flower spikes helps keep the garden neat and reduces the risk of disease.
9. Phlox: Prevent Mildew and Encourage Blooms
Phlox is prone to powdery mildew, especially in humid conditions. By cutting back the plant after the first bloom, gardeners can improve air circulation and reduce the risk of mildew. This involves removing spent flower heads and trimming back the plant by about one-third.
In addition to disease prevention, pruning Phlox encourages a second wave of blooms. This practice helps maintain the plant’s vigor and ensures a continuous display of color in the garden.
10. Veronica: Extend the Flowering Season
Veronica, with its spiky flowers, benefits from regular deadheading and pruning. After the initial bloom, cutting back the flower spikes can encourage a second round of flowering. This involves removing spent blooms and trimming the plant by about one-third.

By extending the flowering season, gardeners can enjoy Veronica’s vibrant colors for a longer period. Additionally, regular pruning helps maintain the plant’s shape and prevents it from becoming too leggy or overgrown.

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