Iris 'Colonel Mustard'
"Siberian iris"
Orders placed before 1 March 2025
You can expect your order in February/March 2025
Orders placed 1 March - 15 April 2025
You can expect your order in March/April 2025
Orders placed 16 April - 15 May 2025
You can expect your order within 10 business days
UK orders over £50
Free shipping
UK orders under £50
£4.99
Northern Ireland orders under £50
£5.99
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Description
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.
Key features
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Good for cutting
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Perfect for pots
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Comes back every year
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Loved by pollinators
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Naturalising
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Thrives well in full sun
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In peat-free compost
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Low maintenance
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Fully hardy
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Rodent resistant
Specs & details
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Botanical name
Iris sibirica 'Colonel Mustard' (Sib)
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Flower colour
Bronze, copper, gold
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Plant size
1
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Established height
70cm-1m
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Established spread
50-70cm
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Plant spacing
10 plants per m2
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Leaf colour
Green
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Habit
Upright
Clump-forming -
Life cycle
Perennial
Naturalising -
Hardiness
Fully hardy
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Years to establish
1-2 years
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Sunlight
Full sun
Partial shade -
Position
Sheltered
Exposed -
Suitable for
Pots
Large containers
Borders
Meadows
Water gardens
Coastal gardens
Low maintenance gardens
Cut flower gardens -
Soil acidity
Any
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Soil moisture
Damp
Boggy -
Soil type
Loam
Sandy
Clay
Loam-based compost
Multipurpose compost -
Growing skill
Easy to grow
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Scented
No
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Pollinator-friendly
No
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Mouse resistant
Yes
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Rabbit resistant
Yes
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Deer resistant
No
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Toxicity
Skin/eyes irritant
Harmful if eaten
Plant calendar
| Jan | Feb | Mar | Apr | May | June | July | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
- Planting
- Flowering
Useful information
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Soak your Iris 'Colonel Mustard' roots in water for 3-6 hours prior to planting.
Plant your "Siberian iris" bare roots into temporary pots with a multipurpose compost in spring and grow-on in a sheltered spot outdoors.
Choose a pot which comfortably fits the bare roots. Some have a noticeable crown which should be just below the soil surface with any top growth exposed.
Plant out into borders or permanent containers in late spring or early summer once in full growth. Choose a position in sun or shade depending on the variety.
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Orders placed before 1 March 2025
You can expect your order in Feb/March 2025Orders placed 1 March - 15 April 2025
You can expect your order in April 2025Orders placed 16 April - 15 May 2025
You can expect your order within 10 business days
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