Tomato plants grow well in containers, provided the pots are large enough and the plants are kept well-watered and fed. Tomato plants grown in an open garden pull nutrients as needed from the soil. In containers, tomato plants often need more frequent feeding, as the nutrients in smaller quantities of soil deplete quickly. Feed these tomato plants at least once every 10 to 14 days. This is assuming you are using liquid or granules, rather than fertiliser spikes (these are left in the soil).
Things you need
- Tomato fertiliser
Use a good starter fertiliser, mixed in with the potting soil, when you first plant tomatoes. If you've already planted them in containers, add a water-soluble starter fertiliser to the top 2.5 cm (1 inch) of soil and water it in well. When water starts seeping out of the container base, you've watered deeply enough. If you are using a liquid fertiliser, apply it carefully to avoid splashes and follow mixing directions and application directions fully.
Fertilise the plant again in two weeks. This time, use either another water-soluble liquid or granule fertiliser (for tomatoes) or add a tomato fertiliser spike to the pot. Fertiliser spikes release fertiliser gradually over time (up to two months) -- these may be more convenient if you have a very busy schedule. No matter which kind of fertiliser you use, water the soil well so the fertiliser travels down towards the plant roots where the plant can use it.
Continue fertilising the plant every two weeks (unless you use spikes), until the first fruit blossoms appear. When this occurs, start fertilising every week throughout the rest of the growing season.
Tips and warnings
- Avoid getting fertiliser on the leaves of the tomato plant -- this may burn the leaves.
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