Level 90. Works for every Gargantuar levels. The plant on the blinking Power Tile is Shrinking Violet.
Strategy for non-Garg and one flag levels.
Without Shrinking Violet. Replace Cold Snapdragon on the seventh and eighth column with Primal Wall-nuts if you don't have it. The third column can be filled in with a Plant Fooded Infi-nut and Melon-pults/sun producers.