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Mailbag: What to do with a fried hydrangea

Time to prune after too much heat

Sunburnt hydrangea blossom
Now that's a sad-looking hydrangea. If yours looks like this, or even if it doesn't, it's time to prune. (Photo: Kathy Morrison)



Q: My new hydrangea was doing great; first blue blooms were beautiful. It’s got morning sun, then filtered shade and evening shade. After triple digits, the blooms fried. Should I clip them off or leave them alone? The rest of the bush seems fine.

-- Elaine C.

A: You’re not alone with sunburned hydrangeas in Sacramento! Too much sun and 110-degree heat browned the edges of big mop-head hydrangeas as well as their big heart-shaped leaves.

Hydrangeas need consistent moisture throughout summer to avoid browning. (Their Latin name means “water vessel.”) But even with regular irrigation, that scorching stretch in July was just too much.

Hydrangeas tend to wilt easily, due to the large surface area of their big leaves. Morning sun and afternoon shade, such as your hydrangea receives, is as good as it gets for these shrubs in Sacramento.

Hydrangea buds
New buds are forming on this healthy hydrangea (Photo: Debbie
Arrington)

Now is the time to prune off those browned flower heads. While pruning, be careful not to prune off next year’s flowers, too. Those flower buds are now forming on the plant’s woody stems.

Hydrangeas can be pruned anytime between now and November, when the flower heads start to brown regardless of the heat. That gives the shrub enough time for its buds to finish forming and be ready for next spring.

Got a garden question? Send it to
sacdigsgardening@gmail.com .

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Garden Checklist for week of Dec. 8

Make the most of dry weather while we have it this week. Rain is returning.

* Rake leaves away from storm drains and gutters. Recycle those leaves as mulch or add to compost.

* It’s not too late to plant something. Seed wildflowers and plant such spring bloomers as sweet pea, sweet alyssum and bachelor buttons.

* Trees and shrubs can be planted now, especially bare-root varieties such as fruit trees or rose bushes. This gives them plenty of time for root development before spring growth. They also benefit from winter rains.

* Plant bare-root berries, kiwifruit, grapes, artichokes, horseradish and rhubarb.

* Set out cool-weather annuals such as pansies and snapdragons.

* Lettuce, cabbage and broccoli also can be planted now.

* Brighten the holidays with winter bloomers such as poinsettias, amaryllis, calendulas, Iceland poppies, pansies and primroses.

* Keep poinsettias in a sunny, warm location; bring them inside at night or if there’s rain.

* Plant garlic and onions.

* Prune non-flowering trees and shrubs while they’re dormant.

* Clean and sharpen garden tools before storing for the winter.

* Mulch, water and cover tender plants to protect them during threat of frost. Succulent plants are at particular risk if temperatures drop below freezing. Make sure to remove coverings during the day.

* Rake and remove dead leaves and stems from dormant perennials.

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