I planted 20 small mail-order lilacs as a hedge earlier this spring, 3 1/2 ft apart. They are about 18" high, but the leaves seem to be small and withered, hardly any growth. They were planted in a trench with compost mixed in and watered with drip irrigation. The soil is heavy clay, but takes the water well. Comments on growth please.
Newly Planted Lilacs
Certified GKH Gardening Expert
Plants have a difficult time growing in clay-like soils, as it can restrict their root growth. I would recommend that you fix the soil around your plants. This article will help with that: https://www.gardeningknowhow.com/special/organic/how-to-easily-improve-your-clay-soil.htm