Since Brokor started that plant thread I got plants on the brain so thought I'd make a thread on landscaping for security. I used to work for a greenhouse/nursery/feed store and we did a lot of landscaping. Sometimes we'd get requests for burglar unfriendly landscaping that didn't look, well, unfriendly. Of course everyone thinks of roses and cacti, but there are a lot of other unpleasant options out there and quite a few are hot with landscape designers right now. For attractive shrubs with lots of pokey bits, you can't beat the Berberis. Commonly called Barberry, these come in numerous colors and all feature nasty little barbs. Virtually pest and maintenance free, perfect for foundation plantings, hedges, or specimen plants and with spectacular fall color and bird attracting berries, these have become rather commonplace in landscaping for several years now. Attached are pics of Emerald and Burgundy Barberry and a closeup of the thorns. Ilex is another good species. Nearly all Hollies are pokey but IMO hands down the worst is the Chinese Holly. The Blue Hollies (Princess) are also pretty evil. This evergreen is VERY slow growing so cough up the money to buy the largest ones you can, and stick them under windows. Hollies are pretty hardy but do suffer fungus and canker rot so good air circulation is important for them. Closely related to the Berberis, Mahonia is an evergreen shrub with poky leaves and edible berries. Native to China, Japan and Taiwan, it can be found all across the US. Grows in partial shade or full sun and is drought tolerant. Leatherleaf Mahonia is actually considered an invasive plant by the National Park Service but any nursery that buys from Monrovia can get them for you. Pictured is Leatherleaf and Japonica. A good one to train to a trellis is Pyracantha, though it will happily form into a bushy shrub on its own. Covered in spines, this evergreen can go up to 20 ft tall and puts out red berries in the fall that the birds love but you not so much unless you like intestinal distress. These things can become impenetrable if you let them. This is just a small sampling of plants that can be incorporated around the house that will not only deter unwanted visitors, but keep the neighbors happy with their aesthetics.