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Jul 08, This regular removal of entire old stems will prevent your lilac from becoming too tall. Avoid cutting off just the tops of long stems because this can leave the plant with an odd, unnatural shape. With very large stems, a pruning saw. Lilac bushes are some of the plants which need this for proper, orderly growth. You can start pruning them when they are years old, and have established themselves well.

In their case, it is important not only to prune, but also to do so at the right time of the bushcutting.buzzted Reading Time: 4 mins. Apr 28, If the trunks are very thick, you may need a saw.

Cut each branch back by 1/3 to 1/2. The lilac will grow back, but it'll take a season or two. If you discovered that your plant was grafted, be sure not to cut below the graft%(4).

I watched your video and am encouraged to work on my overgrown lilac bushes. I had several overgrown forsythia bushes that I had to cut way back to curtail their growth as they had outgrown or should I say “overgrown” their space.

I must say that I thought your bush looked more like my forsythia bushes than lilacs.