Barbary nut-iris: complete guide

Overview

Barbary nut-iris (Moraea sisyrinchium) is a delicate bulb from the Mediterranean to southwest Asia. The plant grows twenty to forty centimeters high and forms thin, stiffly upright leaves. The plant belongs to the iris family (Iridaceae) and is also called Spanish nut-iris. This plant blooms in April and May with delicate, fleeting blue flowers that open for only a few hours per day.

Appearance and bloom

Morea sisyrinchium has narrow, three-sided leaves twenty to thirty centimeters long, very grass-like in appearance. The flowers are particularly ephemeral: they open only a few hours in the afternoon on sunny days. The flowers are about two to three centimeters across and deep blue to purple-blue in color, with one central yellow blotch. The flowers appear in great numbers on thin, branched flower stems twenty to thirty centimeters tall.

Ideal location

Barbary nut-iris demands full sun and well-drained terrain. This plant grows perfectly on slopes, rock gardens and in drier garden areas. Also suitable for pot culture outdoors or in a cool greenhouse in northern regions. At least six hours of direct sunlight daily is essential for good flowering.

Soil requirements

Very well-drained, moderately nutrient-rich mineral soil is needed. The plant accepts even very poor, sandy soils and also grows on infertile terrains. Avoid heavy clay soils unless greatly improved with sand, perlite or shells. pH between six and seven is ideal. The plant blooms better on somewhat nutrient-poor terrain.

Watering

The plant grows mostly on winter rainfall in its natural habitat. In temperate climates, water regularly during the growth and bloom period (March to May), then drastically reduce. After bloom, almost no water until next season. In pots, ensure sufficient drainage; this is much more important than water quantity.

Pruning and maintenance

Barbary nut-iris requires very little maintenance. Remove dried leaves after bloom period. In temperate climates, bulbs can be lifted annually and stored in a dry, cool place, then replanted in October-November. In warm Mediterranean zones, they can remain in soil provided good drainage.

Maintenance calendar

October-November: Plant bulbs in groups of five to ten. March-April: Growth and bloom in full swing. May: Bloom decreases, remove faded flowers. June-October: Rest, no maintenance. Lift bulbs in July if needed.

Winter hardiness

The plant behaves in temperate climates as a winter grower: blooms in spring, rests in summer. In USDA zone six to nine, bulbs can overwinter in ground. In zone five and colder, bulbs must be lifted before winter and stored indoors in sand. Protect in ground with dry mulch.

Compatible companion plants

Barbary nut-iris grows nicely next to other Mediterranean plants like Spanish lavender (Lavandula stoechas), Spanish sage (Salvia lavandulifolia) and Lenten rose (Helleborus). Also attractive in pot culture with other bulbs like crocuses (Crocus vernus) and small daffodils. In rock gardens, combine the delicate texture with larger saxifrage groups.

Closing thoughts

Barbary nut-iris is an exotic and refined bulb for gardeners who have warm, dry locations available. The unique, fleeting flowers and low-maintenance nature make it a fascinating addition to Mediterranean gardens.