Three magnificent yellow petals crown a rhizome perennial that reaches 8 to 36 inches, rising straight out of shallow water. Yellow iris (Iris pseudacorus) is the plant for pond edges, marshes and brooks, though it never forgives a dry spell: keep its feet permanently wet and a single clump can flower for twenty years.
| Name | Iris pseudacorus |
|---|---|
| Family | Iridaceae |
| Type | aquatic plant, rhizome perennial |
| Height | 8 to 36 inches (20 to 90 cm) |
| Exposure | full sun, part sun |
| Soil | ordinary |
| Flowering | midwinter to midsummer depending on the variety |
| Invasive | Invasive in North America, do not plant |
It simply loves dabbling in water and adapts particularly well to decorating the side of ponds, marshes, brooks and other bodies of water.
The best period for planting yellow iris is spring or summer, usually from late spring to late autumn for the plants to bloom in the following summer.
Success with yellow iris comes down to a handful of conditions, above all water depth and a soil that never dries out. Here is what the plant asks for, point by point.
| Condition | What yellow iris needs | Why it matters |
|---|---|---|
| Planting period | Spring or summer, usually late spring to late autumn | Blooms the following summer |
| Water depth | Shallow water only; 15 to 20 inches (40 to 50 cm) is already too deep | Planted too deep, it will not flower |
| Spacing | About 2 to 4 inches (5 to 10 cm) between plants | Room for neighbouring plants |
| Exposure | Sunny spot, part sun tolerated | Best flowering in full sun |
| Moisture | Water available at all times | Cannot cope with even the slightest dry spell |
Meet these few points and the plant will look after itself for years.
Caring for yellow iris can really become only the occasional check, because this is a flower that requires very little work.
Beyond the wild plant, a handful of selected forms are offered by pond-plant suppliers, differing mainly in flower shade, foliage interest and overall size. Use the table below to match a variety to the size of your pond edge.
| Variety | Flower colour | Foliage | Size band | Best used for |
|---|---|---|---|---|
| Variegata | Bright yellow | Cream and green striped in spring | Medium | Foliage colour at the water’s edge |
| Alba | Creamy white to ivory | Plain green | Medium | Pale contrast with the wild form |
| Golden Queen | Clear yellow, unmarked | Plain green | Medium to tall | Bold uniform yellow |
| Berlin Tiger | Yellow, heavily veined | Plain green | Medium | Close-up interest by a path |
| Bastardii | Soft pale yellow | Plain green | Medium | Softer, paler planting schemes |
| Flore Pleno | Yellow, double | Plain green | Medium | Fuller flowers, longer display |
| Roy Davidson | Yellow with brown veining | Plain green | Medium | Marshy ground and bog gardens |
Native to Europe, it is also found in Asia and North Africa, always in marshy wetlands.
On other continents, such as North and South America, this flower is on the invasive species list. This means it shouldn’t be planted or grown there. Some states have laws prohibiting import and planting. Check with your local agricultural bureau what is allowed in your area.
It thrives near ponds, along running water, both in plains and in lower mountain ranges.
Yellow iris is a hardy plant that survives winter very well.
Cold actually conditions part of the plant’s growth.
Three magnificent yellow petals form the flower.
The lifespan of an iris clump can reach anywhere from 5 to 20 years.
To ensure it lasts a generation, offer it bulb-plant organic fertilizer every year after the blooming.
This is an invasive species destroying wetlands in North America.
Hi Lisa, you’re right. It should only be planted in gardens in areas where it’s native to.