Countdown Grove

Grow zero-root trees on all three marked groves: northwest, center and southeast. In Graft mode, select a numbered tree and tap a neighboring equal tree: the pair becomes one digit smaller at the destination. Zero trees root permanently and cannot move or merge. A zero outside a marked grove wastes the finite garden and ends the run. Transplant mode moves a selected nonzero tree one square into empty soil, spending one of two water drops. There are no refills: the four ones make two zeroes, while the four twos must become two ones and then the central zero. Every graft, transplant or Wait spends one of twelve daylight actions. Choose the destination before grafting; the anchor position is part of the puzzle. Keyboard: Tab and Enter/Space operate buttons; R restarts.