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Dividing Clumps of Ornamental Grasses

Definition: Dividing clumps of ornamental grasses refers to the process of separating a mature grass plant into smaller sections, each with its own roots and foliage. This technique is commonly used to propagate and rejuvenate ornamental grasses, ensuring their continued health and vitality.

Best Time to Divide Ornamental Grasses

Knowing the optimal time to divide clumps of ornamental grasses is crucial for successful propagation. While the specific timing may vary depending on the grass species, a general rule of thumb is to divide them during their dormant season or early spring.

For warm-season grasses, such as Miscanthus, Pennisetum, and Panicum, dividing should be done in late winter or early spring, just before new growth emerges. This allows the divided plants to establish their root systems before the onset of hot summer temperatures.

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Cool-season grasses, such as Festuca, Carex, and Calamagrostis, are best divided in early spring or early fall. Dividing them during these periods gives the plants ample time to establish themselves before the extreme temperatures of summer or winter.

Steps to Divide Ornamental Grasses

Dividing clumps of ornamental grasses can be done using the following steps:

Prepare the tools: Gather a sharp garden knife or spade, a pair of pruning shears, and a shovel.

Water the grass: Thoroughly water the grass clump a day or two before dividing to ensure the soil is moist and easier to work with.

Mark the divisions: Determine where to make the divisions by identifying natural separations or using the desired size of the new plants as a guide.

Divide the clump: Using the garden knife or spade, carefully cut through the clump, separating it into smaller sections. Ensure that each section has a sufficient amount of roots and foliage.

Replant the divisions: Dig a hole for each divided section in a suitable location, making sure the hole is wide and deep enough to accommodate the roots. Gently place the division in the hole and backfill with soil, firming it gently around the roots.

Water and care for the divisions: After replanting, water the divisions thoroughly and provide regular care, including adequate watering, mulching, and fertilizing, to promote their healthy growth.

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By dividing clumps of ornamental grasses at the appropriate time and following the proper techniques, gardeners can propagate these beautiful plants and maintain their vigor and beauty for years to come.

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