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if you hard prune most of the younger trunks and new stems and remove leaves from the lower third of the Fatsia Japonica it will grow higher and faster! i have just done thins to my 2 year olds growing in the ground as they where forming like bushes, hard pruned them and just left the 2 prominent trunks with the lower third leaf less and in 2 weeks they have shot up 30 cm’s with all new growth!!!! I could not believe it… started feeding them to and the warmer weather might of helped but it still seems crazy how fast they have grown…. so they are now forming medium height canopies and i’ll continue now to keep the lower sections bare…..