Best time to repot an outdoor hydrangea

Asked November 7, 2019, 8:41 PM EST

When would be the best time to repot a hydrangea into a larger pot? What type of soil is best to use? The plant I have was originally from a florist arrangement and has been outdoors in a pot for almost 10 yrs now. Thank you!

Washington County Oregon hydrangeas

1 Response

Thank you for your question. Ten years is a long time in the same pot! Your plant can probably use more room for roots! The time to transplant or repot woody perennials such as hydrangeas is when they are dormant, which is about now. You’ll want to find a well-draining pot one to two sizes larger. Buy some organic potting soil—not what is labelled ‘top soil.’ It doesn’t need to have added fertilizer; you can add some time release fertilizer if you want. Water the soil around the plant, as well as the potting soil in the larger container. You’ll want the plant to be in a hole that has the same depth as the ‘old’ one. Carefully remove the plant from its pot. The roots are probably going to be tangled, so either cut them or spread them out with your fingers so they can more easily grow into the new soil. Place in the new container, add soil around the perimeter to fill in the space. Do not push the soil down tightly. Water the plant, and add more soil as necessary. You’ll need to continue watering until the winter rains begin. You can add an inch of organic mulch, such as bark chips, on the soil, but not touching the stems. Here is an OSU article about their care, generally: https://extension.oregonstate.edu/gardening/flowers-shrubs-trees/general-care-hydrangeas Good luck!