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To control the spirea's size and keep it blooming year after year, you should prune.

May 03, When and how do I trim overgrown, poorly flowering, year-old Vanhoutte spirea bushes? Frances Sperl, Denver, CO. Dear Frances, Vanhoutte spirea (Spiraea x vanhouttei) is a popular hybrid of two less well-known species, S. cantoniensis x S. blooms in late spring to early summer, with dense, flattish clusters of clean white flowers, Estimated Reading Time: 2 mins. Feb 20, Birchleaf spirea (Spiraea betulifolia): A compact, rounded shrub growing 3 to 4 feet tall and wide.

White flowers appear in early to midsummer, but this spirea is at its most colorful in autumn, when the dark green, birch-like leaves turn rich shades of red, orange, and purple.

A compact, rounded shrub growing 3 to 4 feet tall and wide.

Early spirea (Spiraea thunbergii). Nov 23, How to Cut Spirea to the Ground. The spirea genus (Spiraea spp.) includes more than 80 species of shrubs known for their showy clusters of small flowers in shades of yellow, white, pink and purple.

Mar 15, However the best time to prune for nearly all of them is immediately after flowering. Get down to the base of the shrub and cut off at ground level 1/3 of the oldest, thickest stems.

After that prune back for height and overall balance and shape. Always cut back to an outward facing bud to direct growth away from the interior of the shrub. Pruning and trimming: ‘Sem’ Spirea should be pruned annually in spring, right after the shrub has bloomed.

Spirea tend not to have a lot of problems but can occasionally be troubled by aphid infestation.

Feel free to reduce it by 12 inches. Feel free to reduce it by 12 inches. Avoid late summer pruning. Bushes need the correct care to grow healthy. Spirea bushes require part sun or shade. The soil condition must have good drainage and a pH of to Bushes need one application of slow-release granular fertilizer in spring. Use at least 2 inches of mulch around the base of the bush to help retain moisture.