Most plants benefit from regular, annual pruning. It may seem like tough love, but pruning keeps them healthy and encourages fresh, new growth and renewal. While annual pruning is good for plants, the trick is in knowing when to prune which plants.
Plants tend to fall into one of three categories for pruning:
- A great many flowering and fruiting plants prefer to be pruned while they are dormant, in late winter through early spring.
- Some flowering plants like spring blooming trees and shrubs start setting new buds as soon as the old flowers have fallen. These will need to be pruned shortly after flowering, or you risk pruning off the new buds with the old.
- And then there are other plants that need to be continually pruned and deadheaded, to remain vigorous and in flower.
Figuring Out When to Prune Your Plants
When to prune can be confusing but pruning at the wrong time is rarely fatal. Pruning at the wrong time of year may result in fewer flowers and fruits, but it usually won’t harm the plant in the long run. The exception to this is pruning too late in the season and encouraging a lot of tender new growth that will be killed back with the onset of winter weather.
When to Prune Flowering Trees, Shrubs, and Vines
Perhaps the most confusing group of plants, when it comes to pruning times, is flowering trees and shrubs. A general rule of thumb is to prune summer and fall flowering trees and shrubs in the dormant season, which is late winter and early spring. Spring flowering trees and shrubs will need to be pruned soon after their flowers fade, in late spring and early summer.
The confusion comes with plants like hydrangeas, roses, and clematis because some of these flower in spring, others in summer or fall, and the rest flower repeatedly. Here are some guidelines for figuring out when your particular variety is best pruned:
- When to Prune Spring-Flowering Trees & Shrubs: Most of the commonly grown flowering trees and shrubs are listed here. After a couple of years pruning, you'll get into a rhythm that produces gorgeous blooms.
- When to Prune Which Clematis: Clematis fall into one of threes pruning categories. You will need to pay attention to when your vine blooms, to determine which one it is in.
- When to Prune Hydrangeas: These rules mostly apply to old-fashioned hydrangeas. Newer varieties will bloom on both new and old wood. However, pruning is necessary for renewal.
- How and When to Prune Your Rose Bushes: It's not as hard as you've been led to believe.
How to Prune Fruit Trees and Berry Plants
Most fruiting plants need to be pruned while they are dormant. You usually get one chance to set buds for next season’s crop, so particular care is taken with fruit trees and berry plants. Most flowering plants grown for their ornamental value will still give you some sort of show, even if you’ve been lax about regular pruning. Fruit trees and berries will steadily decline unless they are pruned and tended. There are several reasons for this, including suckers that direct energy away from fruiting branches, older branches susceptibility to diseases and pests and the habit of many fruiting plants to only produce on branches of a certain age. So if you are growing tree fruits or berries to harvest, pruning them should be given high priority.
- When Your Home Orchard Stops Bearing Fruit: If you haven't been pruning regularly, you may need to do some renewal pruning.
- Pruning an Over-grown Apple Tree: Yes, there's hope for that old apple tree you inherited.
- Pruning Peach Trees: An exception to dormant pruning.
- How to Prune Raspberries and Blackberries: Taming these rampant growers.
Should You Prune Evergreens?
Gardeners don’t often think about pruning evergreen trees, which is probably a good thing. Evergreen trees don’t need to be pruned. It is not recommended that you use pruning to keep an evergreen tree’s size in check—it will stress and distort the tree. Better to choose a smaller, dwarf evergreen than trying to size down a large tree. However, there are times when you want an evergreen in your landscape to be a bit fuller and that can be accomplished with some well-timed pruning. Keep in mind, the larger the tree, the more labor-intensive this type of pruning will be, so do this while the tree is young.
Maintaining Perennial Bedding Plants
Perhaps the most labor-intensive plants to prune are the non-woody perennials. The notion that you can plant perennials once and then have a maintenance-free garden forever is an incorrect notion. Most perennial plants, especially the flowering ones, not only need to be cut back entirely at some point before or after the growing season, they need regular pruning, shearing or deadheading.
Which plants to prune when and how much to prune them is something you learn as you acquire experience gardening. It’s part of the pleasure of gardening for most gardeners and it’s the type of knowledge that varies from region to region. When and how to prune perennial plants probably makes up more garden chat than any other topic. The following articles will get you started:
- Perennial Plants to Prune in the Spring: There are only a few perennials that benefit from being left standing so they can self-mulch over the winter.
- Perennial Plants to Prune in the Fall: Most perennial plants can be pruned in the fall. But if time gets away from you, spring pruning won't do any damage.
- Pinching, Pruning, and Deadheading: Some general tips for year round perennial pruning and maintenance.
Start with the Right Pruning Tools
Whatever plants you have, the first thing you need to consider is the best tool for the job. Sharp, clean tools not only make the job of pruning plants easier, they are crucial to keeping your plants healthy. The four basic tools required for pruning most plants are hand pruners, loppers, shearers, and saws. Here’s a breakdown of which pruning tools are appropriate for your pruning tasks.
Pruning is an ongoing garden task. It gets less confusing and intimidating the more you do it. In fact, you'll learn there are even some pruning practices you can completely ignore.