Doff Tomato Feed Concentrate is a top-quality liquid tomato food with seaweed & magnesium (0.012%Mg) to encourage strong, healthy growth and promote high yields of top-quality full-flavour tomatoes. It is ideal for the feeding of courgettes, aubergines and all flowering plants. This jumbo 2.5 litre bottle will make up to 750 litres of premium tomato feed.