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Althea bushes are relatively low-maintenance shrubs that benefit from light annual pruning to maintain the bush’s shape. 1 Prune in late winter or very early spring before the shrub starts growing. Oct 11, At the beginning of spring, towards February-March, it is time to prune your althea. Althea will bloom on new growth, so you can prune every year.

However, rejuvenation pruning will restore the health of the shrubs.

However, try to avoid pruning late in the season, since this would tend to reduce blooming. Remove all branches that grow inwards so that the shrub can filter light through the inside. Sep 21, Althea is a shrub that can reach up to 12 feet high.

Also known as Rose of Sharon, althea is hardy in USDA map zones 5a to 9a. Prune althea in late winter or early spring.

Use loppers to trim larger branches.

Pruning at that time will encourage new growth which is important since althea blooms on new wood. You can prune althea to restrict height or width or to shape the shrub. The best time to rejuvenate large, overgrown shrubs is late winter or early spring (March or early April). Heavy pruning in late winter or early spring will reduce or eliminate the flower display for 2 or 3 years.

However, rejuvenation pruning will restore the health of the shrubs. Feb 08, In addition to reducing the height, you can cut out dead or diseased wood and remove any out-of-control branches back to the base. Because rose of Sharon blooms on the current season’s growth it should be pruned in late winter. Next winter, remove any new growth from the previous year and an additional third from the existing old stumpclearing.barted Reading Time: 3 mins.