Answer: The best time to do this would be late winter to early spring. Prepare the new planting hole, then dig up the lilac. Take as many of the roots as possible. It will be heavy, so you may need help to lift it out of the ground and then use a tarp to pull it or a wheelbarrow to move it to your new spot. A large lilac will have a huge root system. Replant it right away at the same depth as it grew before, water to settle the soil, and mulch around it with a flat layer of organic mulch several inches thick. Keep the soil moist but not sopping wet for the growing season just as you would for any new plant. You should also trim back the lilac to compensate for lost roots. If you left many roots in the ground when you dug, trim it back proportionately. This means it will not bloom much if at all the year you move it. Make sure the new location is sunny all or most of the day and is well drained, meaning it is not in a soggy low spot. It should also have good air circulation. Good luck with your project!
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