Plant hydrangeas in the right light for the variety
Give morning sun and afternoon shade for most types
Water deeply and consistently during dry periods
Keep soil evenly moist, not soggy
Mulch around the base to retain moisture
Use a balanced fertilizer in early spring
Avoid high-nitrogen fertilizers
Prune at the correct time for the species
Do not prune old wood bloomers in late fall or spring
Remove only dead or damaged stems when unsure of bloom type
Protect buds from late frost
Choose a variety suited to your climate
Test soil and adjust pH if needed
Improve soil drainage if roots stay wet
Avoid overfertilizing
Deadhead spent blooms only if appropriate for the variety
Give plants enough space for good air circulation
Reduce stress from drought, heat, and transplant shock
Wait for newly planted hydrangeas to establish before expecting full bloom