I need help identifying a shrub, how best to shape/prune it, and when. Please see the attached photo (right). It's about four feet tall and the goal is two feet. - M.R. -
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That's a mop false cypress. Could be the green variety, or one of the gold forms (they don't develop much color in shade).
Cut it back as you would a juniper. That means you can cut as far down as there is green within -- falsecypress does not bud out readily from leafless wood.
When we want a plant to respond with lots of new growth, as in this case, we prune shortly before budbreak in spring. That capitalizes on the plants' natural growth cycle and is also good for us in this case. We mean, we're less likely to be fired because people tend to forget each spring which plants' twigs should be bare, and which leafy. Thus they overlook what we've cut back. By the time they take notice and wonder "what happened," the delay in growth our cuts imposed, is ending and the plant's leafing out all over.
That said, you can cut these plants at any time.
Here's the whole story in photos. We recently declared a group of that falsecypress variety to be rehabilitated, after following the regime for two years that we're describing here for you.
These shrubs have lost their laciness and natural roundness to repeated shearing, which also caused all foliage to become concentrated at the top of weak branches. Our goal was to keep them small but improve the shape, texture and foliage density -- which will keep them healthier, too.
We start by checking how far into the interior there is new leafy growth. (To see that look illustrated: We've just done this on a dwarf blue spruce, another plant pruned the same way. We will probably have added that photo by now to Dwarf cut to size.) On species that don't break from old wood, density is our limiter. These plants worried us, as their interior growth was pretty weak. Yet given the options 'cut and see', or 'take them out and start over,' cutting was our choice.
Next, we cut everything down and in to the desired, minus a bit to allow for the year's growth.
Then, cut to promote growth deeper within the plant. Cut about half the branches far enough back to give each cut limb one or two years to grow before it reaches the point where you'll cut it again. Reach in along each branch and cut to just above a side branch with decent foliage. If there is no greenery on a given branch that deep into the plant, then cut that branch all the way out of the picture.
Comparing the next two photos: The more drastic the reduction, the more noticeable the change will be in the first year. Pretty scary here, huh? However, those that need the hardest cut also need to be done sooner rather than later.
Sure, you can say "Ugh." Or you can recognize how much light is now reaching the tiny nibs and scraggly branchlets we left in the shrubs' interiors. We rely on spring's amazing power to pull lots of growth from there.