Pruning Bougainvillea the Right Way Is the Key to More Colorful Blooms – Here's How (and When) to Do It

Whether grown as an indoor or outdoor tropical vine, pruning a bougainvillea may seem like a daunting task – especially if you grow a thorny variety. But learning how to cut back these beautiful blooming vines the right way is simple. It’s also essential to growing vines that produce lots of colorful bracts.

Bougainvillea produce colorful flower-like structures called bracts on a vine. These perennial vines can easily be trained to grow up a vertical surface like a wall or arbor. Two of the key techniques to do this are pruning and trimming.

Pruning and trimming are two different things, but both are essential parts of proper bougainvillea care. Trimming establishes an outline and keeps a plant in a certain growth habit. Pruning, however, is useful for training a plant and for removing old or diseased branches. I’ll walk you through the basics of pruning and trimming techniques for bougainvillea, safety tips, plus how and when to make the cut.

Essential Pruning Tools

Safety Tips for Pruning Bougainvillea

The main difficulty when training, pruning, or trimming bougainvillea plants are the nasty, long thorns most varieties have. When pruning anything thorny, first put on a pair of thick gardening gloves.

Good quality gloves usually cover the forearm as well as the hands. Leather rose pruning gloves, like these ones from Amazon, are ideal for this task. Wearing a long sleeve shirt while pruning can also help prevent cuts and scrapes.

Good safety wear is crucial, but the most important elements for pruning any plant are sharp, sanitized, and strong pruners. For a woody vine like bougainvillea, a pair of loppers like these from Fiskars are a reliable choice.

Sanitize pruners between each cut by dipping them into a diluted bleach and water mixture. Make sure all cuts are clean, too. Ripped and ragged edges take longer to heal over, which gives pests and disease more opportunity to infect a plant.

When to Prune Bougainvillea

If you're asking yourself, “When should I prune bougainvillea?” it really depends on where and how the plant is growing. The best time to prune bougainvillea for cuttings is in late winter to earliest spring before new growth begins, but as buds are just starting to swell.

In USDA hardiness zones 9-11, where these tropical vines can grow outdoors year-round, late winter or early spring is the best time for bougainvillea pruning. Most plants are dormant by mid to late winter and won't be harmed by even a severe pruning.

For severe pruning, wait until the plant is semi-dormant in fall or early spring before making the cut. Bougainvillea plants will also tolerate shaping, light trimming, and deadheading anytime of the year. But major pruning jobs should be left until the plant is dormant.

If grown as tropical container plants in cool climates, you will probably have to cut back bougainvillea every fall. This makes it easier to move them to a sheltered location and keeps them small enough to fit inside homes with limited ceiling heights.

When pruning before moving plants indoors for winter, there really is no right or wrong way to trim them. Just cut plants back to a manageable size and take them indoors before there is any chance of frost in your area.

The plant will probably go dormant after a hard pruning, but will fill back out in spring. It's also a good idea to treat plants for pests and diseases before overwintering bougainvillea indoors.

How to Prune Bougainvillea

Prune young bougainvillea vines from the base to force thicker growth and establish the shape you want for your plant. Typically these plants are trained to trellises or other vertical supports. Use pruning as an opportunity to mold your bougainvillea to its support structure.

Once plants are established, they need minimal trimming in early spring to enhance growth. Some simple tip pruning during this time removes the wood just past a bud node and will encourage a new branch to form at the cut. This produces a fuller plant that can fill a wall or arbor. Trimming bougainvilleas this way also helps keep plants in your desired shape.

You can also prune bougainvillea back to grow it as a shrubby ground cover or hedge in hot, dry areas. This requires more severe pruning. Shape it the way you want, cutting it back to a node like you would when training it up a trellis.

For more general pruning, cut out any dead or diseased wood as it occurs. Also, remove any crowded branches that prevent good air flow throughout the plant. Should foliage on a bougainvillea get damaged by frost, simply trim off the affected parts.