pricker are plants ' protective barrier that helps them escape being devoured . Herbivores enjoy crunch on plant . However , plant life with a thorn barrier are less likely to be eat . Thorns are located in many areas of the flora . Plants like agave and rose have shrill pricker growing on their stalks and stems , while other plants have coarse spines edging their leaves .
Parry’s Agave
This slowly - rise evergreen plant has coarse texture and showy foliage . The Parry ’s century plant has a clumping configuration that mature 1 to 3 feet high and broad . The blueish gray folio are slow with a little potato form – mean they staunch from the base of the plant – and spring up up to 2 feet magniloquent . The thick leaves are butt against in spins with a terminal irritant at the end that is passing sharp . begin in the summertime , the flowers on the Parry ’s agave emerge on 6- to 15 - foundation stalks . The flowers are tinged in red or pink and die down after inflorescence . Parry ’s agave plants expect full Lord’s Day and dry out to medium , well - drain soil . Parry ’s agave plants are also drought tolerant . Their USDA hardiness geographical zone is 9 to 11 .
Washington Hawthorn
The Washington haw is a slowly - growing deciduous tree with a pyramidal form . Washington hawthorn tree diagram grow 15 to 20 feet high and have thorns along their white-haired branches . The bright unripened leafage browse from 1 to 3 inches long and change to yellow in the fall . begin in the spring , small white flowers emerge to ignite up the tree . The bunch up efflorescence have an unpleasant odor and grow up to 2 inch . The berries on the Washington hawthorn are orange - red and persist into the wintertime . Washington hawthorn tree diagram choose full sun to light shade and well - drained filth . These dauntless plants are drouth tolerant but can also tolerate damp situation for short period of prison term . Washington hawthorn are resistive to leaf rust fungus . Their USDA hardiness zone is 6 to 8 .
Mentor Barberry
The wise man barberry is a restrained to rapidly growing deciduous to semi - evergreen shrub . Its vertical mannequin is dense and mounded and the stems are thorny . The wise man barberry develop up to 5 foot high and 7 foot wide , idealistic for growing as a barrier or privacy plant along a backyard patio . The leave-taking on the wise man barberry are blue green , leather - like and arise 1 to 2 inches long . begin in the declination , the leaves turn chicken , red and orange and hold their gloss into previous surrender . begin in the spring , the sensationalistic blossom go forth to counterpoint with the foliage for a gaudy showing . Mentor barberry bushes prefer full sun to fond shade and well - drain soil . They are also drought and heat tolerant , making this a very various bush to grow . The USDA hardiness zone is 5 to 8 .
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