Choose a fertilizer high in potash to encourage flowering. Water pot-grown phormiums regularly to keep the soil evenly moist but take care not to over-water. Feed each spring with a controlled release fertilizer, and pot on into a larger container if the roots are congested.

Do Phormiums need feeding?

Phormiums require full sun in a moist but well drained soil. They will however grow well in poorer soils providing they are given regular granular feeds of a nitrogen based fertiliser. Phormiums are greedy plants which grow quickly if they are well fed.

Why is my Phormium dying?

Phormium may die due to leaf-yellow disease that's caused by bacterial pathogen. Leaf-spot disease is also a common reason why Phormium plant dies. A severe mealybug infestation can also kill a New Zealand flax plant. Phormium tenax is a plant species that is used as an ornamental plant.