You can probably get away with just 1 trio pack but i will say you are going to use more beastie bloom than cha ching and it also depends on what soil... r u going to amend it?... youre going to pre dilute the stuff anyway so im almost positive 1lb of beastie will do 16 plantsI'm trying to predict my expenses. If I use foxfarm "Soluble Trio Pack" ... about how much will I need to grow each outdoor tree? I see 1+1+1 lbs for 80$ on amazon... but how much will my 16 trees need?