The art of the perennial: how to multiply your garden's life
In short: Overgrown perennials aren't a failure of gardening; they are a surplus of life. By mastering the technique of division, you can transform a crowded, unruly bed into a sprawling, multi-generational landscape. It is the process of turning one plant into many, ensuring your garden thrives for years to come.
In the world of horticulture, perennials are defined as long-lived plants that return year after year. However, there is a specific distinction made for the garden: herbaceous perennials, such as hostas and delphiniums, die back to the ground in late autumn while their roots survive the winter. In contrast, evergreen and semi-evergreen varieties, like hellebores and bergenias, maintain their foliage for most or all of the year. Understanding these life cycles is the first step in managing their growth. When a perennial bed becomes overcrowded, the primary solution is division. This involves using a transplanting shovel to cut a single plant into three or four distinct parts. This is not merely a way to thin out a garden; it is a method of propagation. By dividing the root systems and trimming the leaves very short with bypass pruners, you create new, independent plants. These can then be rearranged to create different heights, shapes, and styles—ranging from low horizontal ground covers to towering vertical spires. To successfully maintain these spaces, the process requires specific timing and preparation. Experts recommend planting in the spring or autumn. When dividing, a plastic tarp can be used to hold excavated plants, while starter fertilizer promotes new root growth in the shallow holes. To ensure the garden remains vibrant between blooms, gardeners often intersperse bulbs like crocus and allium for early spring color, and apply 2 to 3 inches of pine bark mulch to protect the soil and retain moisture.
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Sources
- Summary by Intellect · source: How to Maintain Overgrown Perennials | Ask This Old House
- Also: How to grow perennial plants / RHS Growing Guide
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