You can trim it back to almost nothing if you need to.
Nov 15, The good news is pyracantha are very easy to maintain and prune.
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Most pruning, is usually done to help maintain the shape of the plant, whether its trained against a wall or grown as a beautiful hedge. Why it’s important, not to prune out, to much of the previous years growth. Hedge Pruning To start your pyracantha hedge, prune late in the first season or before bud-break in the next season, pruning off half the new growth.
In the second year, again trim off half. Start. Pyracantha – Pruning, Winter Care and Fertilizing. Pyracatha or Firethorn. This shrub should be pruned after it has bloomed. Shape and thin as needed, but keep in mind that you are removing this autumn’s fruit. As the plant matures, renewal pruning will be needed. This is done in early spring, by removing the largest, heaviest canes all the way to the ground.
Feed Pyracantha annually in late winter, with 2 to 3 ounces per square yard of balanced general purpose fertilizer, followed by 2 to 3 inches of organic mulch.
Jan 23, Pyracantha, also referred to as firethorn, flowers on two-year-old wood and so, to ensure an abundance of blooms, do not remove much of the pyracantha bush pruning wood. Prune off.