Answer: Your lilacs may need more sun or at least less competition from the grass to flower well. Remove the grass around the base and fertilizer with a high phosphorous fertilizer such as Triple superphosphate this spring. Hopefully that will help them grow better. Your hydrangea may have a fungal disease effecting the flower buds or an insect. Bring a sample to your local County Extension Office (362-3194) for them to identify if it happens again this spring.
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