Iris ensata 'Ol Man River'

Spring · Outdoors

Apply an organic mulch

Apply a 5-10cm layer of organic mulch around the plant in spring to reduce weeds, retain moisture and keep roots cool in summer. Leave a 10cm gap between the stem and the mulch to prevent stem rot. Before applying mulch, clear the area of weeds and water if it hasn't rained recently. Use biodegradable material such as garden compost, well-rotted manure, leaf mould or bark chippings as mulch.

A mulch is a covering that can: protect the soil surface from rain, heat and cold; deter weeds; provide nutrients. Organic indicates that material has vegetative origin e.g. manure, compost. Synthetics i.e. plastics, or stones are often called mulches.

Spring - late · Outdoors

Feed with sequestrol

If plants are acid loving and grown in soil with little acidity, or in a container, or are watered with limey tap water an annual feed with sequestrol (iron chelate) is highly beneficial. Follow guidelines on the packet. Will also 'blue-up' hydrangeas.

For hydrangeas that have good blue flowers in acid soil, this product can be used with alkaline soil to turn the flowers blue. This is most effective when the soil is neutral or just slightkly alkaline.

Spring-Autumn · Outdoors

Water frequently to keep the soil moist

The plant thrives in moist or boggy soil, doesn't tolerate dryness and should be watered frequently, not only after a period of drought, but if the soil begins to dry out spring to autumn. Check plants in pots more frequently, especially in hot weather.

Summer · Planting

Divide when congested

When rhizomes have become very congested they can be separated or cut. Dust any cut surfaces with a fungicide and replant them. Throw away any poor or diseased segments.

Outdoors

Water with rain water

This plant needs rain water or soft water (the minerals in alkaline or "hard" water are harmful). This is especially important for plants in pots.

Compost · Outdoors

Houseplant compost for repotting

Repot using any good quality house plant compost.