Producing High Yields Of Bright Yellow Courgettes ‘lemona’ Is A Fantastic Performer. The Cylindrical Fruits Reach About 20cm In Length And Are Wonderfully Flavoured.plants Produce Very Few Spines On The Leaves And Stems Meaning That This Tasty Courgette Is Really Easy To Harvest.how To Sow Courgettes Indoorssow Seeds From Mid april Onwards Indoors. The Seeds Are Relatively Large So You Can Plunge One Seed Into An Individual Module Or Small Pot.water Underneath From A Water Tray