Hydrangeas typically flower from mid-summer through to autumn, but if your plant is looking sparse, the problem may be how close together you have planted them. According to experts, spacing is crucial for healthy blooms.
Planting hydrangeas too close together restricts airflow, making them susceptible to fungal diseases. This can discolour flowers and stunt growth. Experts recommend spacing plants three to ten feet apart, depending on the variety.
If your hydrangeas are already too close, selective pruning can help. Remove branches that rub or touch between plants. Alternatively, transplant in spring or autumn when the plant is least active, though older plants may struggle to re-establish.
Fertilising can also boost blooms. Use an organic multi-purpose fertiliser for roses once a year in spring, being careful not to overdo nitrogen, which can reduce flowering.
