Avoid growing with: Asparagus, Carrots, Sweetcorn, Spinach Soak seeds in water 24 hours before planting so that you can separate the seeds. Thinning is nearly always required as seedlings emerge from a seedball of several seeds. If you don't thin them, you will get a number of rather pathetic plants which don't grow to an edible size. Tolerates light frost. Keep well-watered as a dry beetroot will develop a woody and inedible core. For tasty and tender beetroot, start harvesting at golfball-size.