aren't just for the North anymore. Other than trying to figure out which new ones to buy, the main question seems to be about pruning and renovating older plants. ... To prune… other lilacs, although these typically cause fewer problems in Montana than in wetter, more humid climates. For this reason, the best time to prune them would be immediately after they dry up in June. To keep your lilacs … Chinese lilac (Syringa x chinensis) The Chinese lilac is an arching, spreading shrub growing 10 to 12 feet tall and six to eight feet wide. Dieback on common lilac due to fungal infection. PRUNING LILACS PROPERLY Dr. Leonard Perry, Extension Professor University of Vermont Lilacs remain one of the most popular landscape plants in the North, and one of the easiest to grow. Lilacs … Lilacs generally produce more blooms on healthy, newer growth, rather than on older stems, according to Ross Penhallegon, horticulturist with the Oregon State University Extension Service. Based on your description of the plant being “out of control,” you will want to follow the “Renewal Pruning … Syringa vulgaris, the common lilac, is reportedly the most affected species. Lilacs (Syringa spp.) I’m including a helpful link below on pruning lilacs from the University of Minnesota Extension. planting. Compared to the common lilac… Rejuvenation in Pruning Lilacs. Lilacs do not like “wet feet,” so don’t choose a site where water remains or “pools” after heavy rainfall. S. reticulata the tree lilac, is also susceptible.Whether specific … Contact Cornell Cooperative Extension for infor-mation on soil testing (Fact Sheet A-1-0 “Soil Testing”). In June trying to figure out which new ones to buy, the best time to prune would... To figure out which new ones to buy, the best time to prune them would be immediately they. Tree lilac, is also susceptible.Whether specific … planting best time to prune them be! 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