Aha! I didn't know that! Very interesting. Thank you.
The entire radish plant is edible. I've read of people pickling the seed pod before it gets tough. I ate a seed pod when I was out in the garden... not bad. Tastes like a radish. :)
Borage is a good companion for tomatoes and strawberries. Marigolds help to deter pests; I didn't have any soldier beetle issues after I started putting marigolds around the tomatoes.
Japanese Beetles LOVED the marigold flowers. Which is ok, because I catch JBs to feed the chickens. I stopped...
There are a lot of positive combinations. There are also negative combos too. The only one I can think of at the moment is not to plant onions and garlic near beans and peas.
Lots of websites, and that book is a classic.