Siberian Iris Care Keep the soil consistently moist until the plants are established, about a year. Water established plants regularly when drought conditions exist. Feed Siberian iris plants in spring with a nitrogen-rich fertilizer and fertilize again when blooms are spent.
This tetraploid hybrid iris was bred for big flowers on a big plant that should reach 34-inches in height. This mid-late season bloomer features 2 to 5 blooms per stem. The large ruffled, blue-violet falls are veined in white and have a splash of yellow at they base.
Siberian iris flowers are smaller than bearded iris and do not have a beard. They prefer relatively acidic soil and consistent moisture, but will tolerate periods of dry weather. Japanese iris flowere are as big as an outstretched hand, with an open face and broad, ruffled falls.
Great Companion Plants for your Siberian Irises Alchemilla mollis (Lady’s Mantle) Artemisia schmidtiana ‘Nana’ (Wormwood) Euphorbia polychroma (Cushion Spurge) Tanacetum coccineum (Painted Daisy) Aquilegia (Columbine) Campanula glomerata (Clustered Bellflower) Hardy Perennial Salvias (Sage) Paeonia (Peonies)
Let the foliage yellow and die down naturally. Avoid removing any of the foliage until it is completely died back or until the first light frost in autumn—whichever occurs first. Cut off all dead leaves with gardening shears 1 inch above the soil surface or rhizome, if it is visible.
Wilted, spent blooms of Siberian iris can be removed to improve the tidy appearance, but deadheading spent flowers is purely cosmetic and has no actual effect on the health or vigor of the plants.
Irises will bloom best in full sun . They can tolerate as little as half a day of sun , but it’s not ideal. Without enough light, they won’t bloom. Bearded irises must not be shaded out by other plants; many do best in a special bed on their own.
The Siberian iris (I. sibirica), another flower entirely, is well worth your attention, too. Impressively, one mature plant can send out more than 20 stems of flowers at once , in a bloom season that lasts from late April to early summer.
Siberian iris grow two to four feet tall and have grassy leaves that arch over at the tips. The leaves form an attractive clump in the garden that’s virtually care-free. Siberian iris aren’t invasive , but will self-sow.
Siberian irises don’t have to be divided as often as bearded irises . It’s advisable to divide Siberian irises when clumps become crowded, plant vigor declines or clumps have formed solid rings with bare centers. Siberian irises can be divided in early spring or late summer.
Poor rhizomes or bulbs are often the cause of no flowers. Also, the plant needs well-drained soil in full sun for flowers to be produced. Irises in shady locations may fail to form blooms . Depth of planting can also cause iris plants not flowering .
For a spring garden full of blooms, use these companion plants for iris : Columbine. Some other iris companion plants that will quickly fill in as blooms fade are: Salvia. Coral bells. Poppy. Daylilies. Black eyed susan. Daisy. Cranesbill. Foxglove.