How to fertilise raspberries in April for a bountiful summer harvest
April marks the start of the growing season for raspberries as they emerge from winter dormancy. Gardeners are now preparing to fertilise their plants to encourage strong shoots and healthy leaves. The right nutrients at this stage can make a big difference to the harvest later in the year. Nitrogen is the key nutrient raspberries need in early spring. It helps the plants develop sturdy stems and lush foliage. However, too much nitrogen can cause excessive top growth while weakening the roots.
Several fertiliser options work well for raspberries. Cow manure slurry is a traditional choice, mixed at a ratio of one part fermented manure to ten parts water. Gardeners typically apply 5–7 litres of this solution per bush. Another option is ammonium nitrate or nitrate with micronutrients, dissolved at a rate of one tablespoon per 10 litres of water. For those preferring a balanced approach, compound fertilisers containing nitrogen, phosphorus, and potassium can be used. The recommended amount is 30–40 grams per square metre. Urea, or carbamide, is also effective—one tablespoon dissolved in 10 litres of water will feed 2–3 mature bushes. Before applying any fertiliser, the soil should be moist, and any old mulch should be cleared away. Once fertilising is complete, a fresh layer of mulch—such as humus or compost—helps retain moisture and protect the roots. Ten days later, sprinkling wood ash around the plants provides an extra boost of potassium and trace minerals.
Proper fertilisation in April sets raspberries up for a productive season. By choosing the right nutrients and following these steps, gardeners can support healthy growth and a better harvest. The process also ensures the plants remain strong and resilient as the weather warms up.
