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When to Divide or Transplant Ornamental Grasses

Definition: Dividing or transplanting ornamental grasses refers to the process of separating clumps of grass into smaller sections or moving them to a different location in the garden. This is done to maintain the health and vigor of the grasses, promote better growth, and prevent overcrowding.

When to Divide Ornamental Grasses

Ornamental grasses should be divided when they start to show signs of overcrowding or decline in their growth and appearance. The ideal time to divide them is during their dormant season, which is typically in late winter or early spring before new growth begins.

Dividing ornamental grasses during their dormant period allows them to recover and establish new roots before the growing season starts. It also minimizes the stress on the plants and increases their chances of successful transplantation.

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Signs that Ornamental Grasses Need Dividing

There are several signs that indicate it is time to divide ornamental grasses:

• Overcrowding: If the clumps of grass have become too large and dense, with dead or bare patches in the center, it is a clear indication that division is necessary.
• Reduced Flowering: When the grasses produce fewer flowers or the flower spikes become smaller and less vibrant, it may be a sign that they need dividing to rejuvenate their growth.
• Declining Foliage: If the foliage of the grasses starts to look weak, discolored, or sparse, it is a good indication that division is needed to revitalize their health.

How to Divide Ornamental Grasses

Follow these steps to divide ornamental grasses:

Prepare the Grass: Water the grasses thoroughly a day before dividing them to ensure the soil is moist and easier to work with. Trim back the foliage to about one-third of its original height to reduce stress on the plants.

Dig Out the Clump: Use a sharp spade or garden fork to carefully dig around the clump of grass, keeping a generous distance from the outer edges to avoid damaging the roots.

Separate the Clumps: Once the clump is lifted, gently shake off excess soil to expose the individual grass plants. Use your hands or a clean, sharp knife to divide the clump into smaller sections, ensuring each section has a healthy portion of roots and foliage.

Replant the Divisions: Dig holes in the new planting area, making sure they are wide and deep enough to accommodate the divided sections. Place each division in a hole, backfill with soil, and firm it gently around the roots.

Water and Mulch: Water the newly transplanted divisions thoroughly to settle the soil and provide moisture for their establishment. Apply a layer of organic mulch around the plants to conserve moisture and suppress weed growth.

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When to Transplant Ornamental Grasses

Transplanting ornamental grasses is best done in early spring or early fall when the weather is mild and the plants are not actively growing. This allows them to establish their roots in the new location before facing the stress of extreme temperatures.

It is important to note that some ornamental grasses have deep and extensive root systems, making them more challenging to transplant successfully. Therefore, it is advisable to choose the right time and prepare the new planting area adequately to ensure the best chances of survival.

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By dividing or transplanting ornamental grasses at the appropriate times, gardeners can maintain the health and beauty of these versatile plants, ensuring their longevity and continued enjoyment in the garden.

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