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"Smooth hydrangeas should be left to grow for several seasons then can take a hard pruning down to the ground in the spring," says Dillon. Old wood hydrangeas can be cut back by one third .
Hydrangeas should be fertilized in early spring and fall, regardless of whether they've been transplanted. Related: 8 Mistakes You Should Never Make With Your Hydrangeas Frequently Asked Questions
The Southern states fall nicely within the winter hardiness zones of hydrangeas, which range from USDA zones 3 to 9 for panicle and smooth hydrangeas, and zones 5 to 9 for bigleaf and oakleaf ...
Hydrangea flower color changes based on the pH in soil. As the graph depicts, soil with a pH of 5.5 or lower will produce blue flowers, a pH of 6.5 or higher will produce pink hydrangeas, and soil in between 5.5 and 6.5 will have purple hydrangeas. Hydrangea flower color can change based on the pH in soil.
Hydrangea quercifolia flowers are borne in erect panicles 6–12 in (15.2–30.5 cm) tall and 3–5 in (7.6–12.7 cm) wide at branch tips. Flowers age in colour from creamy white, aging to pink and by autumn and winter are a dry, papery rusty-brown.
A reduction cut may be performed while still allowing about 50% of the branch. This is done to help maintain form and deter the formation of co-dominant leaders. Temporary branches may be too large for a removal cut so subordination pruning should be done to slowly reduce a limb by 50% each year to allow the tree to properly heal from the cut.
Some types of hydrangeas can be lifted and divided, but the best time to do this is spring. Our experts don't recommend lifting and dividing hydrangeas in the winter, as this can increase the ...
It can handle full sun to partial or dappled shade. H. intergrifolia may take 5 to 7 years to reach maturity and begin blooming but will bring layered texture and brightness high up in shady areas where these traits are rare. It fares best in milder climates such as USDA hardiness zones 8a to 10b.