Planting Arisaema

Where to plant Arisaema?

Arisaema thrives in a woodland setting, alongside ferns, ligularias and hostas, which share the same need for moisture and cool conditions. It particularly appreciates a partially shaded position, ideal for recreating the shady, humid conditions of its natural habitat. A west-facing aspect is often most favourable, providing gentle light without excessive direct sun.

It prefers soils that remain cool in summer without becoming waterlogged, and well-drained in winter to avoid any risk of bulb rot. Arisaema dislikes stagnant water, especially during the colder season.

Plant Arisaema in slightly acidic soil, possibly neutral, but never alkaline. The soil should be rich in organic matter, light and humus-rich. In naturally heavy or clay soils, it’s advisable to improve the soil structure to promote good drainage: you can mix into the planting soil 1/3 compost and 1/3 non-alkaline sand.

Arisaema can also be grown in pots, provided it’s placed in shade, in a well-drained substrate that remains slightly moist.

When to plant Arisaema?

Arisaema is best planted in autumn, between September and November, when the soil is still slightly warm, thus encouraging root development before winter. This timing allows the plant to establish itself well for vigorous growth the following spring.

It is also possible to plant in early spring, from March to April, once the risk of severe frost has passed. However, growth will be slightly slower in the first year, as the plant will have less time to develop its root system before temperatures rise.

How to plant Arisaema?

In the ground

• Dig a hole approximately 25 cm deep and wide using a shovel or spade.
• Loosen the soil at the bottom of the hole with a hand rake or aeration fork to encourage root growth.
• Add leaf mould and mix it with the soil to enrich it. If the soil is heavy (clay-based), incorporate coarse, non-calcareous sand to improve drainage. If the soil is chalky, mix equal parts ericaceous compost and leaf mould to create a slightly acidic growing medium.
• Place a layer of perlite or fine gravel at about 8 cm deep to prevent waterlogging, a common cause of bulb rot.
• Position the bulb on this drainage layer, with the pointed end facing upwards.
• Cover with soil and firm gently.
• Water moderately.

Arisaema is hardy and can withstand temperatures as low as -15°C, provided the soil remains well-drained in winter. In very cold areas, a thick mulch of dead leaves offers effective frost protection.

In pots

• Choose a wide, shallow terracotta pot with drainage holes.
• Place a layer of gravel or clay pebbles at the bottom to ensure good drainage.
• Fill the pot with a mix of half leaf mould and half vermiculite or perlite for a light, well-draining growing medium.
• Plant the bulb about 6 cm deep, with the pointed end facing upwards.
• Cover with the growing medium and firm gently.
• Water moderately.
• Place the pot in a shaded, cool spot, protected from excessive heat.

How to care for Arisaema after planting?

Caring for Arisaema is quite straightforward, provided you meet its needs for moisture and drainage. After planting, it’s essential to keep the soil cool but never waterlogged. Regular watering is necessary during the growing season in spring and summer, especially during prolonged dry spells. However, ensure water doesn’t stagnate, as excess moisture is the main enemy of bulbs. In winter, when the plant becomes dormant, watering should be significantly reduced or even stopped if the soil remains naturally moist.

To maintain soil moisture in summer and protect the bulbs from frost in winter, we recommend applying an organic mulch made of dead leaves or bark. This reduces water evaporation in hot weather and forms an insulating barrier when temperatures drop. In regions with harsh winters, a thicker layer of mulch can be added for extra protection against the cold.

In early spring, add some well-rotted compost or an organic fertiliser rich in organic matter to encourage new growth. Arisaema doesn’t require intensive feeding, but a rich, well-balanced soil supports its long-term growth.

In autumn, when the foliage turns yellow and dries out, let it wither naturally. This allows nutrients to return to the bulb, strengthening its reserves for the following season. Once the foliage has completely dried, you can cut it back to ground level. Finally, check the plant regularly for signs of rot or water stress and adjust watering or drainage if needed.