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Left plants (1st position): red/orange (orange is what you want)
middle plant (2nd position) yellow/ green (green is what you want)
Right plant (3rd position): blue/indigo (indigo is what you want)

OK, so looking at your current plants:
the orange heart if the right shape, but wrong colour for the indigo sweettooth as the blue is visiting (the blue and indigo visit the plant in the 3rd position).   So you need to try to find another heart colour to attract the indigo sweetooth.
BUT, the orange heart is the right shape and colour for the indigo lollipup so that plant is a keeper.
The orange heart is also the right colour, but wrong shape for the indigo sugarsnout as the blue sugarsnout is visiting - that orange heart is pretty popular, lol.

Attract orange critter means left most plant is the right shape and colour so it's the correct left most plant for the violet of that critter
Attract green critter means middle plant is the right shape and colour so it's the correct middle plant for the violet of that critter
Attract indigo critter means right most plant is the right shape and colour so it's the correct right most plant for the violet of that critter

Attract a red critter means the left most plant attracted it and its the right shape but wrong colour to attract the same orange critter
Attract a Yellow critter means the middle plant attracted it and its the right shape but wrong colour to attract the same Green critter
Attract a Blue critter means the Right most plant attracted it and its the right shape but wrong colour to attract the same Indigo critter

de

ed and orange critters wills always be attracted by the left most plant
yellow and green critters will always be attracted by the middle plant
blue and indigo critters will always be attracted by the right most plant

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Violet combo is the plants that attracted orange green and indigo of the same critter 

Take note of what you attract and what plant shape and colour attracted it
different combos to use with all 4 foods
   a      b        c
   c      a        b
   b      c        a