red valerian

Water red valerian (Centranthus ruber 'Albus') deeply but infrequently during the growing season. A thorough soaking once every 2 to 3 weeks is usually enough. During the hottest summer months, increase waterings slightly; frequency and amount of water can be decreased during cool or wet weather. During dormant periods the plant will benefit from periodic watering, but usually no more than once a month. Be careful not to over water as wet soil can lead to root fungus.

Red Valerian needs between 4 and 6 hours of sunlight a day. It should receive this sunlight evenly throughout the day with no more than 2 hours of consecutive sunlight. While it likes sunshine, it should not be planted in an area with direct sunlight for the entire day as this can burn the leaves. To help create optimal growing conditions for Red Valerian, it should be planted in an area that receives dappled shade throughout the day. If planted in a sunny area, it may require occasional supplemental watering.

Red Valerian can be pruned in late spring and late summer. It is best to prune these plants lightly, removing just the spent flowers and some of the longest stems, to keep the plant from becoming unruly. The new flowers and foliage will then fill in the gaps and tidy up the look of the plant. Pruning in late spring or early summer stimulates new, fresh foliage and flowers; however, care must be taken not to over-prune as this can weaken the plant. Pruning in late summer encourages new growth which means plants have time to develop before winter.