DH just re-did our landscaping in the front of our house right before we had to go out of town for a week. Our neighbors were so sweet, they told him they would water while we were away. They did, but only once and the blooms on the three cannas we put in suffered. The yellow ones are dead, but I see a new stalk coming up; the red blooms are dead; the pink blooms are dead except for one. Should I cut the dead ones off; pull them off or just leave them alone? The leaves look great, it's just the flowers that died.

Thank you!