Vigean Hydropon

Graft represents both a static ability and a triggered ability. “Graft N” means “This permanent enters with N +1/+1 counters on it” and “Whenever another creature enters, if this permanent has a +1/+1 counter on it, you may move a +1/+1 counter from this permanent onto that creature.”

If a permanent has multiple instances of graft, each one works separately.