Growing Bulbs Under Trees

A Guide to Choosing and Planting bulbs under trees

Planting bulbs under trees can transform shaded areas of your garden into vibrant displays of colour, especially in the spring when trees are still bare. The key to success is selecting the right types of bulbs that can thrive in these unique conditions. Here’s a guide to the best bulbs for planting under trees, along with some tips to ensure they flourish.

1. Snowdrops (Galanthus)

Snowdrops are among the earliest bulbs to bloom, often appearing in late winter or early spring. Their delicate white flowers can create a beautiful, naturalised look under trees. However, snowdrops can be quite challenging to establish from dry bulbs. Instead, it’s best to plant them “in the green.”

What Does “In the Green” Mean?
Planting “in the green” refers to the practice of planting snowdrops when they have just finished flowering, and still have green shoots. This stage is ideal for moving and dividing existing clumps. Simply dig up a clump of snowdrops, separate the bulbs gently, and replant them in the desired location under your trees. This method significantly increases the success rate of establishing snowdrops in a new area.

2. Daffodils (Narcissus)

Daffodils are a popular choice for planting under trees due to their bright yellow flowers that bloom in early to mid-spring. While standard daffodils can be used, dwarf varieties are often a better choice for under-tree planting.

Why Choose Dwarf Daffodils?
Dwarf daffodils die back earlier than taller varieties, making them less likely to look scruffy as the season transitions from spring to summer. They also allow more space for other plants to grow once they have finished flowering. It’s essential to let the foliage die back naturally after flowering, as this helps the bulbs store energy for next year’s blooms. Dwarf varieties do this more quickly and neatly, making garden maintenance easier.

3. Crocus 

Crocuses are perhaps the easiest bulbs to establish under trees. They bloom in late winter to early spring, often before most other plants have woken up from their winter dormancy. Their low-growing habit and vibrant colours make them a perfect choice for naturalising in shaded areas. Crocuses require minimal care and are excellent for adding early-season interest.

4. Bluebells (Hyacinthoides non-scripta)

English bluebells are quintessential woodland plants, making them an ideal choice for planting under trees. They bloom in mid to late spring, creating a carpet of blue that can transform shaded garden areas into magical spaces.

Patience is Key
Bluebells can take some time to establish, so patience is required. Once they do, however, they can spread naturally and create a dense ground cover. This process can take several seasons, so it’s important to give them time and space to settle in.

5. Grape Hyacinths (Muscari)

Grape hyacinths are known for their striking blue-purple flower spikes that bloom in early to mid-spring. They are hardy and can grow in a variety of conditions, making them suitable for planting under trees.

Containment Considerations
However, grape hyacinths can be invasive, spreading rapidly and sometimes becoming a nuisance in the garden. To control their spread, consider planting them in pots sunk into the ground. This method allows you to enjoy their vibrant colour without the risk of them taking over your garden.

6. Anemone blanda (Grecian Windflower)

These bulbs produce charming, daisy-like flowers in shades of blue, pink, or white. They bloom in early to mid-spring and are well-suited to growing under deciduous trees. Anemone blanda can create a lovely ground cover, complementing other early bloomers.

7. Cyclamen (cyclamen coum or hederifolium )

Cyclamen are low-growing plants that thrive in shade, making them a great choice for planting under trees. They produce delicate flowers in late winter to early spring, with foliage that often remains attractive throughout the season. Cyclamen can add a touch of elegance to shaded garden areas. Sometimes hard to establish from corms easier and quicker to establish and spread from large existing clumps. 

8. Scilla (Scilla siberica)

Scilla, or Siberian squill, offers bright blue flowers in early spring. They are hardy and can naturalise well under trees, creating a vibrant blue carpet. Scilla is a low-maintenance option for shaded areas and pairs well with other early spring bulbs.

Tips for Planting Bulbs Under Trees

1. Choose the Right Spot: Plant bulbs where they will receive enough light in early spring, before the trees fully leaf out.
2. Prepare the Soil: Ensure the soil is well-drained but retains some moisture. Adding a bit of leaf mulch can help improve soil conditions under trees.
3. Space Wisely: Give bulbs enough room to grow without overcrowding, which can lead to poor performance, especially in the competitive environment under trees.
4. Watering and Care: Water bulbs during dry spells, particularly in their first year. This helps them establish strong root systems.

By selecting the right bulbs and following these tips, you can create a beautiful and low-maintenance garden area under your trees that blooms year after year. Enjoy the process of transforming these shaded spaces into colourful displays!