Some people wait until March or so, when new growth begins, to prune the cactus.
When the bloom begging to wilt.
Yes, you can cut back a cactus without harming it if you use clean, sharp tools and make clean cuts at the base of the stem. It's important to wear protective gloves and be cautious of the cactus spines.
cut the plant back when you see it is ready to blossom.
Carefully pull the needles out and and squeeze/cut the cactus.
cut it open
Not while they are still greenish in color. Wait until they have died back or you might not have many blooms next year.
Yes, Italian heather (Erica ventricosa) can be cut back after it blooms.Specifically, June is a good month for cutting/pruning/trimming Italian heather. But it is important to remove just the faded blooms. Cutting/pruning/trimming off wood with flowers may affect future flowering.
Yes, it is recommended to cut off dead hydrangea blooms to encourage new growth and improve the overall appearance of the plant.
To effectively repair a broken cactus, you can use a clean, sharp knife to cut off any damaged or rotting parts. Allow the cut area to dry and callus over for a few days before replanting in well-draining soil. Water sparingly and provide indirect sunlight to help the cactus heal and grow back.
The peonies should come back but they may not be as strong as they could be. The plant needs the leaves to gather energy for the new blooms in spring.
Cut back hard, cut out about 20% every other year or so. You should have all new growth and they might not bloom the first season after the trimming but they will remain healthier and support better blooms.
Well... If you cut your head off you are going to die. Your head wont grow back.