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Turn a butterfly bush into a butterfly tree

By: Garden Gate staff
Follow these simple steps to transform a butterfly bush into a small tree for a cascade of flowers that butterflies will love!

You can train a butterfly bush (Buddleja davidii) as a standard, or single stem, so it looks like a small tree. This form is perfect for a container or small garden. Here’s how to do it:

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Step one — Choose a leader

Start with a young plant, preferably one that’s less than a foot tall. Select the straightest upright stem as your leader — often the tallest one in the center of the plant is the best pick. You'll train this to be the trunk of your butterfly tree.

Insert a sturdy stake next to the leader, as the illustration above shows. This keeps it growing straight and tall. Tie the leader to the stake with something soft and pliable, such as strips of fabric or nylon stocking. Leave the side stems for now to help the plant gather energy for growth. But keep an eye out for suckers that may form at the base of the plant and remove them.

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Step two — Pinch and prune for shape

As the butterfly tree grows up to 4 ft. tall strip off all any side shoots that form along the leader. A proportion of two-thirds trunk to one-third head looks good. Continue to attach the leader to the stake spacing the ties about a foot apart.

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Step three — Trim for flowers

Once the head begins to round out, pinch back the tips of the branches, as in the illustration, to encourage more growth and so it forms a thick, full display of blooms.

As your tree grows, you might have to put in a taller stake to support it. Insert the new stake in the same spot as the old one to avoid damaging roots. Continue to tie the trunk to the stake and adjust the ties occasionally so they don’t strangle the tree. After the trunk thickens and becomes stronger, you can remove the support stake. Or if your tree is in a very windy spot leave the stake in place for extra support.

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Step four — Prune to maintain

As the head grows and fills in like the one above, prune stems just as you would any other butterfly bush: Remove a few older branches every year, and do a bit of shaping after the “tree” flowers. Trim off any sprouts from the ground or from along the trunk. This is a fast-growing plant, so you may need to do quite a bit of trimming to keep it looking neat and tidy.

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