Courgette Seeds - F1 Defender An RHS Award of Garden Merit Winner The Courgette F1 Defender is a British bred courgette that is resistant to cucumber mosaic virus which often decimates marrow plants in our gardens. The Courgette F1 Defender produces very heavy crops of mid-green, slightly speckled courgettes. The Courgette F1 Defender is an ideal variety for people just starting to grow their own vegetables. Being perfect to grow in small spaces too these courgettes will be great in any garden space. Being a tasty variety of courgette that is easy to grow, the F1 defender variety is an admired winner of the RHS Award for Garden Merit.