My least favourite seeds? I don't like very much the Fanleaf, Gladiatus and Multiflora seeds. The tier 1 Lemonbush makes me thinking of the old potato I forgot on the bottom of my fridge and who began to germinate!!
Among the flowers, I don't like the Fragrant and the Tilia.
There is no foliage that I really don't like and a lot that I like very much.