25x Large-flowered gladiolus 'Black Jack' red

Gladiolus 'Black Jack'

25x Large-flowered gladiolus 'Black Jack' red

Gladiolus 'Black Jack'
Summer contrast
It's not something you see often! The large-flowered gladiolus 'Black Jack' is very dark red, with black edges. A dark touch that catches the eye in any summer garden. The gladiolus also attracts butterflies. Plant the tubers in the spring. The flowers bloom in the summer.
Space the tubers out when planting. The distance between plants is three times the width of the tuber. Plant the tuber the depth of three times the tuber's height. Place the gladioli in full sun. 0 The flower bulbs come in organic packaging. 100% degradable and contributes to a healthy and sustainable lifestyle.
All our flower bulbs have the A quality mark of the Holland Selection and come with a 100% guarantee that they will grow and bloom. You can be certain that the flower bulbs will grow.

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25x Large-flowered gladiolus 'Black Jack' red
25x Large-flowered gladiolus 'Black Jack' red
25x Large-flowered gladiolus 'Black Jack' red
25x Large-flowered gladiolus 'Black Jack' red
How we measure

We measure the diameter of the bulb. A bigger bulb contains more food for longer flowering and a stronger plant.

Bulb circumference: 10 - 12 cm
Color: Red
Delivery type: Supplied as bulb or tuber
Edible: No
Flowering: July - September
Cutting flowers: Yes
Grafted: No
Green stayer: No
Growing Height: 80 - 100 cm
Guarantee: 1 year growth and flowering guarantee
Hardy plants: No
Latin name: Gladiolus 'Black Jack'
Leafs all year: No
Preferred location: Sun, Half shadow
Naturalizing: No
Planting depth: 10 - 12 cm
Planting distance: 12 - 15 cm
Scented: Not Scented
Self polinating: No

In the spring, plant the Gladioli 'Black Jack' bulbs about 7-10 cm deep and approximately 10-12 cm apart. Prepare a suitable hole and sprinkle the bottom with a layer of sharp sand to allow rainwater to drain well below the bulbs as Gladiolas prefer rich, well-drained soil. Improve garden soil by mixing in a garden fertiliser. Sprinkle some lime on the soil during the winter. Lighten heavy soil with some sharp sand before planting. These large-flowered Gladioli 'Black Jack' like to grow in a warm, sunny area.

Gladioli 'Black Jack' make a great combination plant

These large-flowered Gladioli 'Black Jack' have a striking, deep red colour. You can create special combinations along your border by planting a group of Gladioli 'Black Jack' next to Cosmos 'Flamingo' or Dahlias. A very natural effect occurs when combining with ornamental grasses, such as Japanese Blood Grass (Imperata Cylindrica 'Red Baron'). This large-flowered species also makes great cut flowers.


Fertilise your Gladioli 'Black Jack' regularly to allow for the growth of new flower buds. It is a good idea to add fertiliser when watering. Stop fertiliszing three weeks after flowering. The stems of Gladioli 'Black Jack' can be very heavy and sometimes need some support. Completely cut off its faded stems. Plant Gladioli 'Black Jack' preferably in a different place each year in nutritious soil.

Keeping gladiolus through the winter

Gladioli 'Black Jack' bulbs can easily be preserved during the winter. After the first night frost, cut off all stems 10 cm above the bulb and let them dry. Shake the soil off the bulbs and place them in a box of compost and sharp sand. Store the box in a frost-free area. Attach a label with the name of the Gladioli 'Black Jack' to remind yourself for the following year. By the following spring, you can plant your bulbs again and Gladioli 'Black Jack' will reward you once again with its beautiful flowers.


Would you like to use your Gladioli 'Black Jack' as cut flowers? Pick them when the lower flowers begin to open, preferably early in the morning. Immediately place the stems in a bucket full of lukewarm water with cut flower food. Due to its strong stems, the Gladioli 'Black Jack' can 'reach' for water easily. Here is an extra tip: plant an extra group of Gladioli 'Black Jack' two weeks later. As a result, the flowering period in your garden will be extended.


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