Jun 03, Your first step in removing old lilac bushes this way is to cut the bushes to ground level with a chainsaw. Burn or dispose of all of the foliage. The second step in getting rid of lilac bushes with chemicals is to apply herbicide containing Glyphosate. Jul 21, Dig around the base of the lilac bush using a shovel or spade. The goal is to expose as many of the roots as possible within 2 or 3 feet of the trunk. Begin the procedure by removing one-third of the large, old stems at ground level in late winter.
The following year (again in late winter), prune out one-half of the remaining old stems. Also, thin out some of the new growth. Retain several well-spaced, vigorous stems.
One solution to the problem of removing old lilac bushes is pulling them out. Watering the ground around the plant thoroughly helps loosen the soil.
You can try pulling out the roots by hand if the plant is young.
Use a shovel and hoe to dig down on all sides, exposing the roots. Use the shovel to remove the entire rootball. Jul 08, Garibaldi, if you get the rootball out, you should be OK. If you have access to a tractor, or even a come-a-long, tie a strap around the base of the lilac, put some tension on it, and start whacking the roots on the opposite side.
Keep adding tension as you cut the roots, and eventually it will pop out of the ground. Mar 26, Remove all old and dead wood, hard prune any remaining limbs to about 2-feet, and thin the suckers to leave only the strongest. Remove the trees entirely and plant something that prefers shade.
In either case, I would have no Lilac blooms in April, but in fact, I had none anyway. I chose the sec ond option. The first step in removing a lilac is to cut down the exposed portions of the plant.
Depending on the size and age of the shrub, a pair of sturdy pruning shears and a small limb saw can remove the above-ground vegetation, leaving small stumps near the surface of the soil.