height forsythia grows after cutting it down in one year

Question

we have one year old forsythia bushes. If I cut them back to a foot, how high will they grow and produce flowers next year. We just planted them a year ago in the spring. Only 1 flower on them this year. Have about 15 plants – some are 2 feet high and some are 4 feet high this year. Or should I not cut them back. What is the best way to produce flowers and bushy plants? Most are lying on the ground. A few are upright.

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Answer 1

A yearly trim will keep their growth in check, but wait till after they bloom in spring to prune them. They bloom on old wood so trimming any later will reduce or eliminate the next year's blooms.

https://www.gardeningknowhow.com/ornamental/shrubs/forsythia/forsythia-pruning.htm