Monty Don's Essential Pruning Advice for Gardeners
As gardens awaken with the arrival of March, enthusiastic gardeners across the country are reaching for their secateurs to tidy plants and encourage vigorous new growth. However, cutting at the wrong time can lead to catastrophic results, potentially eliminating an entire season's floral display. Fortunately, renowned gardening expert and television presenter Monty Don offers a straightforward solution to this common problem.
The Six-Word Mantra That Saves Your Garden
Monty Don's guidance distills into a memorable six-word rhyme that every gardener should remember: "Flowers before June, do not prune." While this might appear overly simplistic, this rule effectively helps distinguish between plants that bloom on mature wood from the previous year and those that flower on the current season's fresh growth.
On his popular gardening blog, Monty elaborates, "The old rhyme 'if it flowers before June do not prune' will get you out of most trouble." Many spring-blooming shrubs develop their buds on stems that were formed during the preceding summer. This means the flower buds destined to burst open this spring were actually created last year. If these plants are trimmed in late winter or early spring, gardeners often inadvertently remove those precious buds before they ever get a chance to blossom.
Instead of this misguided approach, Monty Don recommends pruning these shrubs only after they have finished flowering. This timing allows the plant to produce new shoots that will bear flowers in the following year. This principle applies to a variety of beloved garden shrubs, including:
- Forsythia
- Lilac
- Philadelphus (mock orange)
- Weigela
- Amelanchier
All of these plants develop their blooms on the previous year's growth, so cutting them back now could result in forfeiting most of the spring spectacle. Once their blooms have faded in late spring or early summer, they can be safely trimmed and shaped.
Detailed Pruning Guidelines for Popular Plants
Monty Don provides specific pruning advice for four common garden plants, ensuring gardeners can nurture their gardens with confidence.
Roses
"There is a lot of mystique about rose pruning, whereas the reality is that they are all tough shrubs that can take a mauling by anything from secateurs to a flail cutter and bounce back," Monty notes. "However, there are three considerations to bear in mind when pruning roses."
The first point concerns Hybrid teas, floribunda, and Hybrid perpetuals, which produce flowers on the current season's growth. "So they should be pruned hard each spring," he explains. Shrub roses require very little pruning—"I prune mine in winter and early spring." True climbers benefit from pruning during autumn or winter, while ramblers need cutting back just once during mid-summer.
Buddleia
Not every plant follows the "avoid pruning" guidance in spring. Some actually thrive with a vigorous trim during this period. Monty advises, "If you live in the south or a sheltered area, February is the best time to prune the Butterfly bush, Buddleia davidii, and it can be done any time in the coming month in colder areas. It produces its flowers on new growth so if it is cut back hard new, just before it begins growing, you will both stimulate extra new shoots and make sure that the shrub has as high a proportion of flower to wood as possible."
Monty frequently encourages garden enthusiasts not to shy away from a good prune when it comes to buddleia. This shrub can be drastically cut back to a low framework, typically around 30–60cm above the soil, eliminating any weak or intersecting stems.
Clematis
The pruning of clematis often leaves gardeners scratching their heads, but a handy rhyme provides some guidance. Early-flowering clematis varieties, such as Clematis montana, Clematis alpina, and Clematis armandii, blossom in spring on the previous year's growth, which means they should not be pruned prior to flowering. Instead, these should only be pruned post-flowering, once the blooms have faded.
In contrast, later-flowering clematis behave differently. Many summer-blooming varieties, including Clematis viticella and Clematis jackmanii, flower on new growth. These can be pruned hard in late winter or early spring, often cutting the stems back to approximately 20–30cm above the ground.
Hydrangeas
Many popular varieties, particularly mophead and lacecap hydrangeas (Hydrangea macrophylla), adhere to Monty Don's rule because they also bloom on old wood. Pruning them too severely in spring risks removing the buds that will yield summer flowers. Instead, Don advocates a gentler approach, advising gardeners to remove the old flower heads and trim back to a pair of healthy buds below.
This straightforward clean-up—known as deadheading—safeguards the developing buds whilst keeping the shrub tidy. Nevertheless, certain hydrangea varieties display different characteristics. Hydrangea paniculata and Hydrangea arborescens, which includes the popular 'Annabelle', produce blooms on fresh growth. These particular species can be cut back more substantially during late winter or early spring to promote robust new shoots and more impressive flowers as the season progresses.
By following Monty Don's simple six-word rule and these detailed guidelines, gardeners can avoid common pruning mistakes and ensure their gardens flourish with vibrant blooms throughout the year. Remembering when to prune based on flowering times is key to maintaining a healthy and beautiful garden landscape.
