The secret to a vibrant spring garden begins this autumn
While your garden appears to be retreating into dormancy, a vital window of opportunity is opening. By planting specific bulbs now, you can ensure a spectacular explosion of colour when the frost clears, transforming bare borders into a seasonal masterpiece with minimal effort.
Timing is the most critical element in bulb cultivation. According to RHS Horticultural Advisor Nick Turrell, the window for planting spring-flowering varieties like daffodils, crocus, and hyacinths is ideally by the end of September. For tulips, the deadline shifts to November. If you miss these autumn windows, you risk poor flowering results, especially if the bulbs have undergone lengthy storage.
The mechanics of planting depend on the bulb's dimensions. A reliable rule of thumb is to plant most bulbs at a depth of two to three times their own height. For instance, a bulb measuring 5cm high should be placed in a hole 1-1.5cm deep. To ensure a dense, impressive display, aim to plant in groups of at least six, often requiring between 25 to 50 bulbs to create a significant impact in a border.
Soil conditions and placement also dictate success. Most hardy bulbs, such as tulips and daffodils, thrive in warm, sunny sites with excellent drainage, reflecting their origins in dry summer climates. Conversely, species like Cardiocrinum prefer the cool, moist conditions of woodland habitats. When planting in containers, using a grit-enriched compost mix can help maintain the necessary structure for showy varieties like alliums and lilies.
Once positioned with the 'nose' or shoot facing upwards, the soil should be replaced and gently firmed. While watering is not always critical for autumn-planted bulbs in moist ground, it is essential to water immediately after planting if the soil is dry, ideally using rainwater.
Source: How to plant spring flowering bulbs in autumn | The RHS
