Kelp extract is a highly-nutritious natural fertilizer that promotes plant growth, fruit set, disease resistance and resilience to environmental stressors. It's also a great soil conditioner. Approved for use in certified organic production, this extract comes in convenient and cost-effective powdered form that easily mixes with water for foliar spraying or ground application. This is what we use regularly on our own crops.Comes in an 85 gram packet, which will give you up to 255 litres of solution.