When and how can I prune Chamaecyparis? They are loose-looking and also outgrowing their spot.
To prevent Chamaecyparis and other Cypress Family conifers (including some others with fan-like needles, like Arborvitae and juniper), from getting too big and bulk them up a bit, you can gently head the branches back occasionally. This means snipping off just some of the ambitious tips where the spray-like flattened needles fork, telling the plant gently to redirect its growth into fullness rather than elongation. Note: Never cut back into old wood on a Chamaecyparis or the others mentioned (I was able to find a video that might help describe why and how to prune lightly this way, better than I can here).