So I had a “small” ponderosa lemon tree and a much larger Meyer lemon tree in my greenhouse. The ponderosa was healthy, however his growth was extremely erratic with tons of tiny twig branches with just 1-2 leaves on them. A severe pruning was overdue. I skelatonized it about a month ago to get rid of the craziness and refine the shape. As of yet I see no signs of new growth…. I skelatonized my Meyer tree also at the same time. Although healthy, they Meyer is planted into the greenhouse floor and counldnt be moved. Sadly he had somehow developed a massive infestation of scale bugs. Since he’s in the corner, getting to the back side of him was incredibly difficult and getting rid of the scale was just impossible…. He was also overgrown and had not had a big trimming EVER… So I did them both and now I’m worried that I did something wrong. I’ve never done a big cut back like this before. These trees are my babies!! Please tell me if there is anything g I can do to help them recover! I’m sending a picture of the Meyer after his trim…. Hopefully I did it correctly.
These sites (California Rare Fruit Grower and Gardening Know How) indicate that major pruning should be done after last freeze in spring, but before summer's heat. Unfortunately, your timing on pruning your lemons could be an issue with their recoveries; you probably won't know whether they'll come back or not until spring. There's nothing you can do now to help them.