Unpack bare roots or rhizomes on arrival and plant them within a week. Until then, keep them somewhere cool and ensure the roots remain slightly moist, never wet.
Out of season
Spice up your colour palette with the punchy heat of Iris sibirica 'Colonel Mustard'. With petals in two shades of mustard (Dijon and English) it’s clear how this handsome creation got its name! Burnished bronze, copper and gold tones bring a cosy warmth to a planting scheme, providing an eye-catching contrast against blues and mauves. Look closely and you'll see that these flags feature their own little hint of mauve—not only do these blooms feature their own little contrast, but they effortlessly tie in harmoniously with any purples surrounding it.
You can plant hardy Iris sibirica 'Colonel Mustard' in borders with moist but free draining soil and they will return perennially. As they mature, they begin to spread into larger clumps which produce more flowering stems. Over time, the result is an established clump which provides an impressive, unmissable display of flowers among structural, upright sword-like foliage. Flowering in early summer, this is a great plant for combining with plants like Gladiolus byzantinus, Geranium or Geum.
Quantity
Plant profile
Plant calendar
Remove the packaging straight away, check the compost and water thoroughly if dry. Check the plant’s hardiness before placing it outdoors. Plant into a border or permanent container within a month, choosing the position recommended for the variety. Keep the top of the root ball level with the surrounding soil, firm gently and water well.
Soak the roots in water for three to six hours immediately before planting. Keep any crown, buds or emerging shoots above the water where possible.
Pot most bare roots into 15–20cm pots filled with peat-free multipurpose compost. Large or depth-sensitive roots, including peonies, are often best planted directly into borders.
Arrange the roots naturally without bending them. Cover the roots completely, positioning the crown and buds at the depth recommended for that particular perennial.
Keep pots in a sheltered outdoor position and water whenever the compost begins to dry. Grow on until roots hold the compost together when lifted from the pot.
Plant into a suitable border or permanent container once well rooted. Add a label and water regularly throughout the first growing season while the perennial establishes.
- Botanical name
- Iris sibirica 'Colonel Mustard' (Sib)
- Flower colour
- Bronze, copper, gold
- Established height
- 70cm-1m
- Established spread
- 50-70cm
- Growing skill
- Easy to grow
- Habit
-
Upright
Clump-forming - Hardiness
- Fully hardy
- Leaf colour
- Green
- Mouse resistant
- Yes
- Plant size
- 1
- Plant spacing
- 10 plants per m2
- Pollinator friendly
- No
- Position
-
Sheltered
Exposed - Rabbit resistant
- Yes
- Scented
- No
- Soil acidity
- Any
- Soil moisture
-
Damp
Boggy - Soil type
-
Loam
Sandy
Clay
Loam-based compost
Multipurpose compost - Suitable for
-
Pots
Large containers
Borders
Meadows
Water gardens
Coastal gardens
Low maintenance gardens
Cut flower gardens - Sunlight
-
Full sun
Partial shade - Toxicity
-
Skin/eyes irritant
Harmful if eaten - Years to establish
- 1-2 years
Good for cutting
Perfect for pots
Pollinator-friendly
Fragrant
Thrives in full sun
Perennial
Fully hardy
Packed peat-free
Naturalising
Low maintenance
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Iris 'Colonel Mustard' reviews
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