All plants require nutrients. Dissolved in soil water and taken up by the roots, they’re vital for the formation of new roots, shoots, flowers and fruits. As a rule of thumb, the larger and more vigorous the plant, the more nutrients it’s likely to need.
But what type of fertiliser is best? Sandy, free-draining soils tend to be more nutrient hungry, so it’s a good idea to use granular, pelleted or slow-release fertilisers that won’t quickly drain out of the soil. By contrast, silty and clay soils retain nutrients better, so most plants will be happy if garden compost or well-rotted manure is added.