[header] How to prune cucumber plants [title] Prune your cucumbers when they grow 1-2 ft (0.30-0.61 m) tall. [step] For best results, prune your cucumber plants after they grow to a decent size. On average, you can prune them 3-5 weeks after they start to grow. 
[substeps] If you prune a cucumber too early, it may not develop properly and the vine may get damaged. This ensures the plant can support cucumbers later in the growing season.