What variety are you planting? I usually use ‘Jade Cross.’ I tried a purple variety last year, (’Rubine’, heirloom)but the sprouts were puny. :(
They like full sun, lots of nitrogen and cooler temps, so try to time it so your fall temps aren’t higher than 75 degrees - if you can in this crazy growing season!
Boston pickling...wife and daughter like to snack on them.