Royal Horticultural Society Award of Garden Merit Long-term harvests Withstands common diseases A firm favourite in the UK Tomato Shirley F1 is a cordon type which gives you a longer-harvest of fewer tomatoes than bush varieties. The bonus of this is harvests at just the right quantity at any one time over the whole of the summer and into autumn. Experts from the RHS love that it’s easy to grow and offer a great taste and texture.