Beetroot Seeds These seeds produce round, dark purple beets with striking concentric white rings through their centres. Sow a patch and harvest thinnings as micro-greens, allow seedlings to grow to golf-ball sized baby beets – great pickled. Wait a week or so more for full-sized roasting beetroot – delicious! Heirloom Germination guaranteed. This packet contains approx 150 organic seeds. Sow in Spring, Summer, Autumn.