Monty Don: Get bigger tomatoes with one-ingredient homemade fertiliser

Tomatoes are a favoured crop in gardens due to their ease of growth, but they are heavy feeders requiring more nutrients than other plants. Monty Don from Gardener's World suggests that tomatoes will yield larger and tastier fruit if sufficiently fed with potassium, an essential nutrient for fruit production.

The gardener also revealed that a homemade potassium fertiliser can be easily made to boost crops, using just one common garden plant, reports the Express.

Monty stated: "Potassium is what plants need to form good flowers and fruit, and fruiting flowers like tomatoes and gooseberries have quite a high potassium demand. You can boost that at this time of year and improve fruit production. One way of doing that is to go to a garden centre and buy liquid or granular fertiliser, but there's no need as you can also grow your own supply of potassium really easily through comfrey. "

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Comfrey is a typical garden weed recognised for its large hairy leaves which are rich in potassium and other necessary nutrients for tomatoes such as calcium.

Monty explained: "Its main use to me in this garden is to provide the raw material for a liquid feed that's high in potassium.He further cautioned: "A caution about comfrey is that once it gets established it has deep roots and it's quite hard to get rid of. However, you shouldn't get rid of too much as it really is so useful."

You will need:

The method:

Monty said: "The idea is to loosely fill a bucket or just put what leaves you've got, then put water in on top of that and leave it to brew for three weeks. Make sure to