One thing I will never have to deal with is monkeys!
I didn't know that about the roots of onions and celery. I'll have to try it this year. I wonder if I could get anywhere with those inside during the winter. I miss spring onions an awful lot during those wintry months.
My late uncle used to grow hiw own herbs and a few veggies on his apartment balcony high up on the 18th floor.
I think so many more of us can grow at least some food than do. It much healthier, not only the food but also the activity itself.
I hope you do get that greenhouse going.