Let me try to understand your product list/structure
Lets pick Plant 1 as an example
Plant 1 is available in 3 different sizes ??, Plugs(3), 9cm pot, 1 litre pot
If I buy 5 plug sets (15) I get a discount on the standard price
If I buy 10 plug sets (30) I get a different discount ?
Same logic for the pots
Are all plants the same price??
Please let me know how this works