but what do you do with 50kg of basil... I love pesto and it's a great addon to many things, but I don't see myself using more than a couple hundred g per week.
Once you have an abundance of it, you can really just put it in everything. Anything with tomato is better with basil, plus any sandwiches, salads, pizzas, pasta dishes. I have rabbits, so they get through a lot of fresh herbs (especially the stems) and give me fertilizer back in the form of... little round spheres.
Besides that, I preserve it by making it into pesto, chutneys and other basil-based sauces, oils, jars of dried flakes and freezing it.
Anything I have left over, I give away to friends and family.