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If you are trimming burning bushes to rejuvenate them, you should be doing this in early spring, before the burning bush starts to put out leaves. If you are pruning a burning bush to shape it, you can prune it while it is dormant, in either late winter or very early spring.
Consequently, can I prune burning bush in summer?
Prune new growth back later in the season. To maintain the right shape, you should prune the burning bush again in the middle of summer. Burning bushes are usually grown for their autumn foliage, so you don't need to worry about accidentally removing flower buds when you do a summer pruning.
Moreover, can I prune burning bush in the fall?
Burning bush (Euonymus alatus) is grown for its brilliant red fall foliage. Pruning your burning bush shrub in late winter or early spring each year keeps it looking good and improves its health. With simple routine pruning, burning bush is unlikely to require more severe pruning in the future.
If a burning bush does not turn red, it may not be a burning bush at all. The scientific name for burning bush is Euonymus alata. Other plant species in the Euonymus genus look very similar to burning bush when young, but never turn red. Another possibility is that the plant is still too young.