How easy do you find it to bin seedlings? It’s certainly not something I do willingly and it’s a shame when there’s no one else interested. So, the alternative course is to find a space, somehow, anyhow, for them to grow.
The downside of the front garden is that I didn’t want to put protection over the kale here. However, from observations of cabbage white butterflies in the back garden, I think that rocket (aragula) is warding them off the other brassicas planted alongside it.
Perhaps the butterflies don’t like the spiciness!