What am I missing?
Maturation
When healing you or an ally, grant them Minor Toughness which increases Max Health for 10% for 10 seconds.
*Casts Living Trellis*
(the vines heal the target for xx health each time they take damage and an additional xx health when they expire)
So because the vines are doing the healing and not the Warden, you don't get the buff? Because I don't.