How to plant bulbs, corms and tubers

Bulbs, corms and tubers - we give you the lowdown.

CFM Gardening: planting bulbs

There’s something very British about planting bulbs, corms and tubers to ensure colourful displays in your spring garden. Bulbs can be planted in containers or borders and look effective when naturalised in grass, particularly in spring before the rest of the garden has woken from its winter dormancy.

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How to plant bulbs

Hardy bulbs like tulips and daffodils enjoy a sunny site with good drainage as they come from areas with dry climates. However, bulbs from woodland habitats, such as snowdrops, thrive in the shade of trees and fences.

Bulbs need to be planted with the pointed tip facing upwards. Most bulbs prefer a well drained soil that won’t sit waterlogged in winter as it may cause them to rot. You can improve light or sandy soils with garden compost and heavy soils with compost plus grit.

Growing bulbs in containers

For maximum impact you can plant bulbs in containers. Depending on the planting time and storage conditions, container displays can be prepared for special occasions. When potting up, use a good quality compost with a handful of fine grit to improve drainage. Water bulbs in containers regularly if there are signs the bulb is drying. Bowls or pots without drainage holes should be tipped on their sides after watering to allow the excess to run out. Once the bulbs have finished flowering they will enter a dormant period and you can reduce watering.

How to plant bulbs in grass

Planting bulbs in grass can make a natural impressive spring display. Naturalising bulbs in grass can make an impressive display. For a spontaneous look, scatter them across the planting area and plant each one where it lands. Use a trowel to dig a hole to the recommended bulb planting depth and cover the bulb with soil.

Planting depths for bulbs and tubers

So, you are wondering how deep to plant daffodil bulbs or when to plant tulips . Most bulbs can be planted at a depth of approximately 3 times their own height.  However, these planting depths will not apply for containers as the top of the bulbs should just be showing at the surface.

Of course, some tubers are best started off indoors or in a frost free greenhouse before transplanting outdoors. For example, begonia tubers should positioned just below the compost surface and a frost free greenhouse will ensure they will survive.

Bulb/Tuber

Bulb Planting depths

Planting distance between bulbs

Position

Allium bulbs

10cm (4")

10cm (4")

Full sun

Begonia tubers

1cm (1/2 “)

30cm (12”)

Full sun, semi shade, dappled shade

Crocus bulbs

10cm (4")

7cm (3")

Full sun, semi shade

Daffodil bulbs

10cm (4”)

10cm (4”)

Full sun, semi shade

Dahlia tubers

15cm (6”)

45cm (18”)

Full sun

Bluebell bulbs

10cm (4”)

10cm (4”)

Dappled shade

Gladiolus corms

10cm (4”)

15cm (6")

Full sun

Hyacinth bulbs

10cm (4”)

8cm (3”)

Full sun, semi shade

Iris reticulata bulbs

10cm (4”)

8cm (3”)

Full sun

Lily bulbs

20cm (8”)

15cm (6”)

Full sun, semi shade

Narcissus bulbs

10cm (4”)

10cm (4”)

Full sun, semi shade

Ponerorchis tubers

2.5cm (1”)

7cm (3”)

Dappled shade

Ranunculus corms

8cm (3”)

25cm (10”)

Full sun

Snowdrop bulbs

10cm (4”)

10cm (4”)

Dappled shade

Tree lily bulbs

20cm (8”)

15cm (6”)

Full sun, semi shade

Tulip bulbs

15cm (6”)

13cm (5”)

Full sun

White Egret Orchid tubers

2.5cm (1”)

7cm (3”)

Dappled shade

Winter Aconite bulbs

5cm (2")

5cm (2")

Full sun, semi shade, dappled shade

 

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