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 phosphorus 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. When plants turn sickly despite adequate watering and sun exposure, something might not be right with the soil.
When you’re shopping for fertiliser to use on your tomatoes, you’ll 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, nitrogen is important for the leaves and potassium promotes faster growth. You can also make your own fertiliser from manure and compost.