Fertiliser is the secret ingredient to healthy tomatoes. But which type you’re going to use depends on the soil you’ve got in place. Balanced soil that contains enough nitrogen and phosphorous is an important prerequisite for strong growth. You can get your soil tested to ensure you’ve got enough of both. If you can’t get a soil test done, a good way to assess soil balance is by monitoring plant growth. Where plants turn sickly despite adequate watering and sun exposure, something isn’t right with the soil.
When you’re shopping for fertiliser for tomatoes, you will be able to choose between organic and synthetic options. As the name suggests, the organic fertiliser is made from natural products like compost. It’s best to look for a fertiliser that contains: phosphorus, nitrogen and potassium. Phosphorus stimulates root growth while nitrogen is important for the leaves and potassium promotes faster growth. You can also make your own fertiliser from manure and compost.