At least 1. Maybe I could have got 3 altogether, at a pinch. Also 200+ gorse seeds, which have begun to look in danger of damping off, so I'm thinking they'll be better off at the allotment in the fresh air. I'm worried about slugs, snails and woodpigeons, though, so I put them in a wheelbarrow, covered with a net.
Also this morning, planted a row of beetroot detroit.