Really, anytime from early spring to mid-summer falls under the optimum timing range for when to fertilize azaleas. The numbers refer to the proportionate amounts of nitrogen, phosphorus and potassium in the product. By incorporating Vitax Azalea, Rhododendron and Shrub Fertiliser, together with moss peat or other acidic soil supplements, the plants will be provided with iron and the soil pH reduced allowing essential nutrients to be released for plant uptake. Located in Kentish Town, London, Boma garden centre is proud of its vision to transform the city into an urban paradise. However, I prefer late summer since the labs are not so busy and I can get the results back in time to develop a fertilization plan.

The formula feeds through both the roots and the leaves to give plants all the nutrients they need for strong and healthy growth. Woodlands Garden Centre is a well-established large family run Garden Centre that was established in 1969. Don’t spend a lot of time learning how to feed azaleas until you are sure the plants require fertilizer.If you use fresh sawdust or wood chips as mulch on your azaleas, you’ll probably need to fertilize the plants. Ideal for all ericaceous and acid loving plants - indoors or outside - such as Berberis, Magnolia, Heather, Hydrangea and Pieris.

This fertiliser is ideal for acid loving plants, helping them thrive in both neutral and acid soils, producing bigger blooms, greener leaves and robust plants. Sign up for the Gardening Know How newsletter today and receive a free download of our most popular eBook "How to Grow Delicious Tomatoes. g. Azalea, Camellia, Rhododendron, Berberis, Magnolia, Heather, Hydrangea, Pieris, Raspberries, Skimmia, Blueberries. litres ( 1 gallon) of water for outdoor plants, and 1 small spoonful per litre of water for houseplants.It includes a temperature-controlled coating that regulates the release of nutrients when the conditions are right for feeding. Some fertilizers labeled for flowering trees and shrubs also may have the correct NPK balance for azaleas.