Looking at the Plant Banner skill, I'm not sure how to interpret this.
"All allies within a 30-foot burst immediately gain a number of temporary Hit Points equal to half your Intelligence modifier. *These temporary Hit Points* last for 1 round; each time an ally starts their turn within the burst, *these Hit Points* are renewed for another round."
Many people seem to think the amount of THP received after the initial burst is replenished each round if they stay in range, but the way it is written I'm not so sure. It says "these hit points," referring to the hit points received in the initial burst, "last for 1 round"; then again "these hit points" (presumably the same hit points received from the initial burst) are "renewed for an additional round."
If they replenish every single round, this ability is absolutely busted in my mind; for comparison, look at the Wood Kineticist Aura Junction, which grants 1 THP/round in their 10' aura at level 5, scaling up to 2 THP at level 10 and 3 THP at level 15.