How to protect hydrangeas from deer

Net the shrub on a frame that holds the mesh clear of the foliage, or run a repellent on a strict schedule through the growing season and again in late winter. The critical window is winter and early spring, when deer take the buds that would have been this year's flowers.

Hydrangeas come up constantly in deer questions for a simple reason: they are a preferred browse plant, they are expensive, and they are usually planted somewhere prominent. Losing one is both a gardening problem and an aesthetic one.

The damage that actually matters

Summer browsing on leaves looks dramatic and the shrub usually shrugs it off. Winter and early-spring bud damage is the expensive one, because many hydrangeas flower on old wood — the buds formed the previous season. A deer that strips those buds has removed this year's flowers, and the shrub will leaf out looking healthy and simply not bloom.

That timing is the single most useful thing on this page. People protect hydrangeas in June, when they can see the plant and the damage, and leave them exposed in February when the loss that costs them a summer is happening.

Netting, held clear

The most reliable option, with one condition that decides whether it works at all: the mesh has to be held off the foliage. A deer browses straight through netting resting on leaves. Draped netting protects nothing; netting on a frame, or a cage over the shrub, protects everything under it.

Tenax publishes 7 ft x 100 ft polypropylene netting, which is enough to cage several shrubs. Two cautions carried over from garden netting: tension and pin every edge, because slack netting is an entanglement hazard for birds and small mammals, and check it after storms.

For a small shrub a rigid pop-up cage is easier than building a frame. ANC POP publishes 40 x 40 x 30 in, which suits a young or compact hydrangea and nothing larger.

Repellent, on a calendar

Repellents work on hydrangeas as well as on anything, with the standard limits: rain strips the coating, new growth is untreated, and a hungry deer will eat something it dislikes.

1. Buy concentrate, not ready-to-use, if you are treating a border. Plantskydd's 2.2 lb powder publishes a yield of 2.5 gallons; cost per treated area is what determines whether you keep spraying.
2. Spray in autumn, before the buds are at risk, and again in late winter. This is the application people miss.
3. Reapply after heavy rain and after any significant flush of new growth.
4. Rotate genuinely different products. Plantskydd is blood-meal based and Bobbex is a different formulation, so alternating them is a real rotation rather than a change of label.

A dormant shrub in February holds a coating well — there is no new growth diluting it and no flush of leaves to cover. Winter is when repellent on a hydrangea is at its most effective, which is convenient given that is also when it matters most.

What about the fence?

If the hydrangeas are inside a garden you can fence, fence it and stop thinking about this. Michigan State University Extension puts effective perimeters at 8 to 10 ft, with woven wire at 10 ft as the only sure barrier, and a fence is the only measure that does not decay. The height guide covers the terrain cases where a shorter mesh fence holds.

Most hydrangeas, though, are planted at the front of a house where a 10 ft fence is not happening. That is precisely why this page is about netting and repellent — they are what is left when exclusion is not socially available.

The free measure

If you are still choosing where to plant, put hydrangeas where they are not the first thing a deer meets. Boundary planting takes the pressure first, and moving a preferred species behind less-preferred ones changes what gets browsed. Deer-resistant plants covers how to use that properly — and is honest that nothing is deer-proof under enough pressure.