Most of these plants are hard to handle! The spiky bits can be the leaves, sharp ends to branchlets, or just plain spines. All of them can be used to control access to places you don't want people or animals to go. On the other hand, many of these are loved by birds. The spikiest? - probably the Tree Violet (more spikes than leaves) and the Furze Needlebush, which is a seriously difficult plant to prune.
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Click on the species name to go to the listing for the plant in the main alphabetical catalogue.
The main alphabetical catalogue has cultivation details, prices, and a link to photos of each species.