Wednesday, March 24, 2010
Forsythias grow best in full sun but will tolerate light shade. Average soil that could be on the moist side is ideal but as with most plants, good drainage is essential. This shrub falls under the category of those to prune right after flowering is finished. Once it is mature, prune out the oldest and thickest stems every two or three years for the plant to remain vigorous. A shrub that has become overgrown can be fixed by pruning the entire thing back to 15 cm from the ground and after six to eight weeks, thinning the branches out by half.
After their magnificent show of blooms in spring, forsythias become a nondescript shrub in the garden so would do well to be part of a mixed border where other plants can take over with colour once it is finished.
Garden folklore recommends that when forsythias are in bloom, it's time to cut the roses back and this is a good rule of thumb to follow.