March Garden Pruning Deadline
Gardening expert Monty Don urges gardeners to prune six specific plant types before March ends to maximize flowering potential. Meanwhile, Martha Stewart's five winter-to-spring tips are trending: prune selectively, protect roots, plan layouts, refresh soil, and start seeds indoors. The timing is critical for spring bloom success.
The urgency of March pruning is tied to a plant's blooming cycle. Shrubs that flower in summer, such as buddleia and potentilla, do so on "new wood" — growth that occurs in the current season. Pruning these plants in late winter or early spring, before they actively start growing, encourages vigorous new shoots that will produce abundant flowers. Conversely, spring-flowering shrubs like forsythia and lilac bloom on "old wood," meaning they form their flower buds during the previous year. Pruning these varieties before they bloom in spring would mean cutting off the very buds that produce the anticipated flowers. For these plants, it's best to wait and prune them immediately after their flowering season concludes. One of Monty Don's key recommendations is to prune late-flowering clematis in the first half of March. This prevents the flowers from appearing higher and higher up the plant each year, which would leave the lower portions bare. Similarly, roses are best pruned between late winter and early spring, once buds have formed but before they open into new leaves. For some shrubs, like cornus (dogwood) and sambucus (elderberry), a hard pruning in March yields a different benefit. This severe cutting back encourages the growth of fresh, brightly colored stems, which will provide a vibrant display the following winter. This method is a form of "rejuvenation pruning" and can be used to manage overgrown shrubs. The timing of the final prune is critical; a mild February might tempt gardeners to start early, but a subsequent late frost could damage the tender new growth spurred by pruning. Pruning during dormancy minimizes stress on the plant, allowing it to focus its energy on healing and new growth once warmer weather arrives. Using the right tools is also essential for plant health. Experts recommend using very sharp and sterilized secateurs, or shears, to make clean cuts. This minimizes damage to the stem and, crucially, prevents the introduction of diseases that could harm or even kill the plant.
