Thorns & prickles & spines, oh my! 😲 Don't get a horticulturist started on spinescent plants! Although all three of these projections serve as defense mechanisms for a lot of plants, they are different! Spines are derived from leaf tissue, thorns from stem tissue and prickles from neither... they are produced by the skin of a plant. Roses don't have thorns, they have prickles. 🤯 Plant ID: Pachypodium lamerei - madagascar palm, Ceiba speciosa - floss silk tree, Alluaudia procera - madagascar oc