When planted in organically rich, well-draining soil, it will grow to a mature height of three to six feet, with a spread of two to five feet. This fast-growing herbaceous rhizomatous perennial loves moist, rich soil, and will grow enormous leaves, up to six feet wide. Dense thorns adorn its dark purple stems and grow on the top and bottom of the leaves. The bushes will grow about 3-4 feet high and will bear fruit up to 25 years. Most of them produce bright red berries that are toxic to humans and pets, so bear this in mind when deciding where to plant. Native to the western US, Oregon grape is suitable for growers in Zones 5-8. If you like your defensive plantings to do double-duty and provide an edible harvest, then consider the Chinese jujube tree, Ziziphus jujuba. If you are planting it near your home, consider whether or not you would still be able to use a window as an escape route. ‘Shanxi Li’ is a thorny, drought-tolerant cultivar suitable for growers in Zones 5-9 that produces large, succulent fruit. Excessive watering will rot the roots and kill the plant. Just be sure to exercise caution if you add this plant in your yard. They are bitter, but when combined with plenty of sugar, can be cooked and made into jams and preserves. Ensure that you keep in mind mature heights, and whether the species you choose is considered invasive in your area. The modified stems grow into flat, succulent pads that store water and are adorned with multiple sharp thorns that can penetrate the toughest leather. Low-growing varieties are ideal for planting underneath windows, and a combination of both large and small specimens make a formidable, impenetrable perimeter barrier. Native to the southwestern US and northern Mexico, ocotillo – “little torch” in Spanish – is hardy to Zone 7 and requires a full sun location and well-draining soil. Suitable for planting along fence lines, as a tall hedge, or as a specimen plant in vulnerable areas, Chinese jujube will provide good protection against intruders. It’s best planted away from the house as it has a tendency to spread, and is useful on larger properties as a dense barrier of thorniness. We have several citrus trees on our property and the thorns are like no other. In spite of the name, they are not edible tomatoes. One of my personal … In the case of a fire or other disaster, you don’t want your plantings to block your escape or cause injury – this is particularly important in the case of upstairs windows. Keep in mind the growth rate and size so you don’t plant in an area that will interfere with your building structure. The thorny, dense branches can grow up to 40 feet long and will provide an impenetrable barrier in exposed areas. Its delicate blooms are white and the foliage turns a deep reddish-brown in the fall. It’s highly adaptable and will tolerate dry or clay soil as long as there is good drainage. It will tolerate some frost, but not over an extended period. If it’s got spikes, lives in the desert, and looks weird, it’s a cactus, right? A dwarf variety, it tops out at two to three feet tall and makes a useful, low, spiky barrier when planted as a hedge or underneath windows. You will need to make sure that you wear thick leather gloves and other appropriate safety equipment. Multiple long, upright, spiky canes grow from a short central trunk, and burst forth with dense clusters of glorious red blooms in springtime, attracting hummingbirds and other pollinators. It thrives in a full sun location with well-draining soil and will reach a mature height of 15-20 feet tall. This fast-growing ornamental tree can reach a lofty 90 feet tall at maturity. Suitable for growers in Zones 9 and above, this plant thrives in heat and sunshine. They set fruit in the second year and then die back. The name blackberry refers to a number of species in the genus Rubus that grow from a perennial crown and produce tart, edible fruit on upright canes from midsummer to fall. Plant under windows, on the inside of fences, or at vulnerable locations around your property to deter crooks. Let’s learn something from the pack rats, shall we? Century Plant. Plan your perimeter borders with larger, spiky species at the back, and smaller, equally unwelcoming specimens in front. The Century Plant is, without question, one of the most beautiful yet unforgiving home security plants... 3. Perfect for xeriscapes, it needs very little water – overwatering will cause root rot. E. grusonii ‘Golden Barrel’ is native to Mexico and can grow up to three feet tall with a similar diameter at maturity. The leaves, stems, thorns, and fruit of both species listed here are poisonous. Growing in dense thickets, the blackthorn is commonly seen in its native England, along the edges of open fields. Long for your reply. Painful to remove, if you have a couple of these plants on your property, no one is going to want to pay you an unexpected visit. If you want a thorny plant that’s going to grow as quickly as possible, the Blackberry should be one of... 2. Pruning can be quite painful with its sharp spines. Small purple flowers contrast with the green foliage and orange armor – appearing from late spring and lasting all through summer. The teddy bear cholla is a slow growing, upright plant with branched stems that tops out at three to five feet tall. However, plants make a much better defense for home security. A climbing variety, it will add a pop of color to your landscape. With diligent pruning, both the upright and the trailing varieties can be trained up the side of a building or fence, or they may left to grow naturally and fill in an exposed corner of a large yard. And around the two balconies, it did double duty as a showstopping display and an effective deterrent against unwanted nighttime visitors. Native to China, where they have been cultivated for over 4,000 years, species of the Ziziphus genus are found all across the temperate and tropical world. Honey locust thrives in Zones 3-8, and will grow into a shrubby, thorny clump unless pruned to encourage a single trunk. If you keep it pruned, the devil’s walking stick will maintain a shrubby, compact form, but it can grow into a large tree up to 20 feet tall. The small dark berries, called “sloes,” are a favorite of mine for making sloe gin. Before you plant, think about your escape routes carefully. The young stems have gnarly thorns that can tear clothing and pierce your skin, but these trees gradually become less thorny the taller they grow. English hawthorns are suitable for gardeners in Zones 5-8, and thrive in full sun locations with moist, well-draining soil. One candidate is rugosa rose (Rosa rugosa), which grows in USDA zones 3 through 9. Hi, do you have any experience of hedges impenetrable to dogs? Native to Madagascar, the land of cuddly lemurs, S. pyracanthos is a member of the nightshade family, which includes potatoes, eggplant, and tomatoes. Trellising climbing plants up the side of your home, particularly in areas with convenient, climbable drain pipes can discourage the cat-burglar from sneaking into upstairs windows. The deciduous bush has large, fragrant, pink, white or red spring flowers and orange to red rose hips in late summer. Make no mistake, the “fur” is made up of numerous barbed spines that will detach from the rounded stems and easily snag any unsuspecting passerby.
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