Plant half-hardy hybrid gladiolus corms directly outside in mid to late spring, or start them under cover earlier. Hardy naturalising types, including Gladiolus byzantinus, can be planted in autumn or spring. Always plant corms during the season in which they arrive.
Out of season
Deluxe
Gladiolus
'Black Star'
sword lily
If it’s decadence and drama you’re after, Gladiolus 'Black Star' has got the goods. With a staggered planting, this strong, large-flowered cultivar can bloom from July to September, proudly displaying spikes of some of the darkest, richest red-black flowers we’ve ever seen! Gladiolus 'Black Star' is a jewel of a plant ideal for weaving through the middle to back of a border or having as a centrepiece in a container display.
Like many gladioli, Gladiolus 'Black Star' will benefit from a little winter protection in the UK. If you garden on heavy, damp soil or live in a chillier region, this is best done by lifting the corms out of the ground in autumn and storing somewhere dry and slightly warm. Keep them there until the following April or May, when it is safe to plant them out again. For those on light, free-draining soil or living in the milder, more southerly part of the country, you will probably get away with leaving them in the ground with a thick layer of insulating mulch.
Quantity
Plant profile
Plant calendar
Grow gladioli in full sun, in a sheltered border or large patio container. They need free-draining conditions, so improve heavy soil with organic matter and grit or plant into a raised bed. For containers, use peat-free multipurpose compost.
Position each corm with its pointed side facing upwards, around 10–15cm deep. Space them approximately 10cm apart when planting in groups. A generous cluster creates a fuller display and allows the flower spikes to offer one another some support.
Water thoroughly after planting, then allow the soil to become nearly dry between waterings while the corms remain dormant. Once shoots appear, water regularly throughout active growth, particularly during warm, dry weather and when growing gladioli in containers.
Most gladioli remain upright without help, although staking is useful in exposed or windy positions. Remove faded flower spikes just above the foliage, then leave the leaves to die back naturally. They can be cut down to ground level in autumn.
Lift half-hardy hybrid gladiolus corms in autumn and store them somewhere cool, dry and frost free. These varieties often give their strongest display in their first year. Hardy naturalising gladioli can remain outdoors where the soil drains freely and does not become waterlogged.
- Botanical name
- Gladiolus 'Black Star'
- Flower colour
- Near-black, brown
- Corm size
- 12/14
- Established height
- 1-1.2m
- Established spread
- 10-20cm
- Growing skill
- Easy to grow
- Habit
- Upright
- Hardiness
- Half hardy
- Leaf colour
- Green
- Mouse resistant
- No
- Plant spacing
- 30 corms per m2
- Pollinator friendly
- No
- Position
- Sheltered
- Rabbit resistant
- No
- Scented
- No
- Soil acidity
- Any
- Soil moisture
- Free draining
- Soil type
-
Loam
Sandy
Stony
Multipurpose compost
Loam-based compost - Suitable for
-
Borders
Coastal gardens
Gravel gardens
Cottage gardens
Cut flower Gardens
Large containers - Sunlight
- Full sun
- Toxicity
- No report
- Years to establish
- 1st year
Good for cutting
Pollinator-friendly
Thrives in full sun
Packed in paper
Low maintenance
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