A long, faded flower spike can make an acalypha look tired even when its leafy growth is sound. Before trimming, identify which parts have finished flowering and which stems are still supporting healthy growth.
Trace a spent spike to its attachment point and use clean tools for appropriate removal. Do not shorten every leafy stem simply to match the length of one old flower.
Check the plant's name
Common names based on tails are easy to confuse. Keep the botanical identification with the plant so advice on size, flowering and seasonal care matches the actual acalypha.
If there are few new spikes, review light, temperature, moisture and recent pruning rather than assuming the plant needs a stronger feed. A change of season can alter the growth you see.
Photograph the outline before shaping it. Decide whether you are removing spent material, reducing size or addressing damaged growth; these are different reasons for a cut. A measured job leaves the structure visible and gives you a clearer basis for assessing what the plant produces next.
The NC Extension profile of Acalypha hispida describes long, hanging flower clusters and pruning after flowering to manage size. Establish that identity first: removing a finished cluster and reducing the shrub’s framework are separate decisions.
Related reading: Dog's Tail vs Cat's Tail Acalypha: Flowers and Growth.