Water

Newly Planted Shrub: Provide 1 to 2 gallons of water, 2 to 3 times a week during its first spring and summer. The goal is to keep the root ball consistently moist—like a wrung-out sponge—but never waterlogged. Established Shrub (Second Season+): Once its root system grows deep, cut back to watering deeply once a week during normal weather. Only increase to twice a week during severe summer heatwaves or extended dry spells. Always water early in the morning. This gives the roots time to absorb moisture before the hot midday sun causes evaporation. It also ensures any water that accidentally splashes onto the leaves can dry quickly in the sun, preventing fungal issues.

Fertilizer

Apply fertilizer once a year in early spring right as the first new green buds begin to peek out on the stems. Stop all fertilizing by late July so the plant can safely transition into winter. Use a slow-release granular shrub and tree fertilizer or a standard 10-10-10 garden mix.

Pruning

You do not strictly need to prune Li'l Annie Oakleaf® Hydrangea every year. Because it is a naturally compact variety that grows neatly into a 3-to-4-foot canopy, it maintains its shape beautiful on its own. You only need to pick up the pruners to remove dead wood or tidy up its size. If you decide to prune, you must do it immediately after it finishes flowering in late summer. Oakleaf hydrangeas bloom on old wood. This means that as soon as the current summer flowers fade, the plant immediately begins growing and setting the invisible flower buds for next summer. Never prune in winter or spring: If you trim the plant during late winter or early spring, you will accidentally cut off all of next year's pre-formed flower buds, completely destroying your summer bloom show. "