If you control no monsters, or all monsters you control are Plant monsters: You can Special Summon this card from your hand or GY, but banish it when it leaves the field, also you cannot Special Summon for the rest of this turn, except Plant monsters. You can Tribute 1 Plant monster from your hand or field; Special Summon 1 "Rikka" monster from your Deck, except "Rikka Black Princess". You can only use each effect of "Rikka Black Princess" once per turn.