Protea Flower Fertilizer. Since the proteaceae are adapted to nutrient-poor conditions chemical fertilizer or manure will burn their sensitive root system. If you feel the need to fertilize however do not use anything containing ammonium nitrate or phosphorus.
If your soil requires fertilizer it is imperative that you use an acidic type of fertilizer that is free of. Prune only the flowered stems of proteas un-flowered stems are next seasons blooms. Proteas grown in pots will need feeding with a controlled release fertiliser thats low in phosphorus.
Protea cuttings on the other hand are susceptible to mold and may fail once planted.
Plants growing in pots tend to need more water since the soil dries up faster. If you feel the need to fertilize however do not use anything containing ammonium nitrate or phosphorus. During the winter place the pots in a light sunny and well-ventilated place as the Protea flowers are prone to fungi infection through the winter. Phosphorus is fairly deadly to protea which is why we recommend against using fertilizer unless absolutely critical.