Level 9 - I had trouble PF Hypno-ing a zombie against the Garg, so I PF-hypnotized the Imp and whallah! Imp refuses to work for Gargantuar and turns into a mutant like him.
Level 10 - Two Hypnotized Gargantuars!
Level 12 - Infi-nut and his shield entered the zone!
Level 90. Works for every Gargantuar levels. The plant on the blinking Power Tile is Shrinking Violet.
Melon Madness!
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.