On the latest RHS gardening update I have just read that, according to Sally Nex, the more plants you grow the more carbon your garden can store away, which is therefore another way of helping to create a more sustainable environment.
This suits my gardening philosophy just fine!
I am so often tempted at plant fairs to buy another addition for my garden, but often without any clear idea of where the plant will go. (And how wonderful to be able to buy plants at the Chelsea Flower Show this year!) Now the idea of packing yet more in makes me feel positively heroic!