That Can Boost Your  Home Security

Thorny Plants


1. Barberry (Berberis spp.)

This thorny plant can form hostile hedges that would deter even the most determined trespasser. It also provides decorative yellow flowers in spring followed by red foliage in fall.

3. Bougainvillea  (Bougainvillea spp.)

Often clambering over walls, where its colorful bracts display beautifully in zones 10 through 12, bougainvillea actually can protect those walls from criminally minded climbers.

4. Crown of Thorns  (Euphorbia milii)

This plant’s blooms are also bracts and, as its name implies, it is one of the spiniest types of thorn bushes.

6. Hawthorn  (Crataegus spp.)

Hawthorns vary in ultimate height from 15 to 30 feet and make prickly hedges—or the type of tree no criminal will want to climb.

9. Trifoliate Orange  (Poncirus trifoliata)

Before the popularization of barbed wire, the tangled branches of this "hardy orange" (which contain spines up to 2 inches long) did a good job of hedging in livestock.

More on

Get the Newsletter

Sign up to receive the best tips and tricks, the latest news and giveaways, and the most inspiring home improvement ideas from Bob Vila, America's Handyman since 1979.