Hi jasolano! In my opinion there is no need to fertilize a blooming orchid with bloom booster or general fert. at this point.. Not heard of the product however if the non bloom orchid is young obtain a orchid fertilizer that is specially formulated for root and leaf growth i.e high nitrogen feed for general growing health. All fertilizers in general must be done in weak quantities at reg. intervals. Once your blooming chids are done and these are also young, remove spike and use general fertilizer to encourage general health and strength. Dendrobium will benefit from a general fert. routine as for the bloom booster let it mature a bit then apply. Im sure other members will offer their two cents' from their experience and expertise so you will be able to obtain a general census.