Viviparity: noun; (of seeds) germinating before separating from the parent plant (from the Latin words vīvus, meaning alive, and parere, meaning to bring forth) (the adjective is viviparous), (Collins Concise Dictionary).

I’d seen a couple of photographic examples of viviparity on Twitter but had never seen this myself until a walk at Cosmeston Lakes Country Park on 28 December. The tiny green shoots on this Teasel are its own seeds which, for some reason, have not been released from the seed head and have now begun to sprout.