Hey MilqMochi, thank you for taking time to play the game!
If you’re talking about these ‘flowers’:
Seedlings

Then here’s the rule for them:
SPOILER
- If RED, give FULL Sun (open both curtains)
- If BLUE, give HALF Sun (open one curtain, one curtain closed)
- If YELLOW, give NO Sun (close both curtains)
If you’re talking about these flowers:
Pustules

Here’s the solution to them:
SPOILERS
Weed + Tentacle + Leaf removed count == Pod lit up count