June in the UK: a time of blossoming gardens, longer days, and the sweet scent of summer in the air. But can you still plant bulbs? The answer is a nuanced yes, with certain caveats. While the traditional bulb-planting season is autumn for spring bloomers, and spring for summer bloomers, June presents a unique window for specific types of bulbs that thrive with warmer temperatures and a head start on their growing season.
Understanding the Bulb Planting Calendar
The conventional wisdom around bulb planting dictates that spring-flowering bulbs like tulips, daffodils, and hyacinths should be planted in autumn. This allows them to establish their roots during the cooler months and benefit from the winter chill needed for optimal flowering. Summer-flowering bulbs, such as gladioli and lilies, are typically planted in spring to enjoy their vibrant display during the summer months.
However, nature rarely adheres strictly to rules. June offers a chance to plant certain bulbs, particularly those that are frost-tender or benefit from a later start. Understanding the specific needs of each bulb is crucial for success.
Bulbs for Summer Planting: A Viable Option
While many focus on autumn planting, several summer-flowering bulbs can be successfully planted in June in the UK. These bulbs often appreciate the warmer soil temperatures and longer growing season that June provides.
Gladiolus: A Summer Garden Staple
Gladioli are popular for their tall, impressive flower spikes that add vertical interest and vibrant colours to any garden. Planting gladioli corms (not technically true bulbs, but commonly referred to as such) in June allows them to flower later in the summer, extending your garden’s bloom time. The warm soil encourages rapid growth, and the longer days promote strong flower development. Ensure well-drained soil and a sunny location for best results.
Lilies: Fragrant Beauty for the Summer Garden
Lilies are another excellent choice for June planting. These elegant flowers come in a wide array of colours and fragrances, making them a favourite among gardeners. Planting lilies in June allows you to enjoy their blooms later in the summer, and it can also help avoid potential frost damage to early shoots. Choose a location with well-drained soil and partial shade, especially during the hottest part of the day. Asiatic lilies and Oriental lilies are popular choices.
Dahlias: A Late-Season Bloom Bonanza
While typically started indoors earlier, dahlia tubers can still be planted in June, especially if you’ve started them late. Dahlias provide a continuous display of stunning blooms from midsummer until the first frost. Planting in June still allows them to establish well and produce a profusion of flowers. Ensure they receive plenty of sunlight and regular watering.
Canna Lilies: Tropical Flair for Your Garden
Canna lilies add a touch of tropical flair to any garden with their bold foliage and vibrant flowers. While they can be started indoors earlier, planting them in June allows them to thrive in the warmer soil temperatures and long days. Canna lilies prefer full sun and well-drained soil. Their large leaves make them excellent focal points in borders or containers.
Factors to Consider Before Planting in June
Before you rush out to plant bulbs in June, it’s important to consider several factors that can impact your success. Soil conditions, climate, and the specific bulb variety all play a crucial role.
Soil Conditions: Drainage is Key
Proper soil drainage is paramount for bulb health. Bulbs left sitting in waterlogged soil are prone to rot, leading to failure. Ensure your soil is well-draining by amending it with compost or other organic matter. Heavy clay soils may require additional drainage improvements, such as adding grit or creating raised beds.
Climate Considerations: Regional Variations
The UK’s climate varies significantly from north to south. While June generally offers warmer temperatures across the country, regional differences can influence bulb growth. In cooler northern regions, choosing bulbs that tolerate cooler conditions is important. In warmer southern regions, providing shade during the hottest part of the day can prevent bulbs from overheating.
Choosing the Right Bulbs: Variety Matters
Not all bulbs are suitable for June planting. Select varieties that are known to thrive with a later start, such as those mentioned earlier (gladioli, lilies, dahlias, and canna lilies). Researching the specific needs of each bulb variety is crucial for success. Read the planting instructions on the bulb packaging carefully to ensure you provide the optimal conditions for growth.
Planting Techniques for June Bulbs
Planting bulbs in June requires attention to detail to ensure they establish successfully and thrive throughout the growing season.
Preparing the Planting Site
Before planting, prepare the planting site by removing weeds and debris. Loosen the soil to a depth of at least 12 inches to allow for proper root development. Amend the soil with compost or other organic matter to improve drainage and fertility.
Planting Depth and Spacing
The correct planting depth is crucial for bulb health. A general rule of thumb is to plant bulbs at a depth of two to three times their height. Spacing between bulbs depends on the specific variety and desired effect. Refer to the bulb packaging for specific recommendations. Avoid planting bulbs too closely together, as this can lead to competition for resources.
Watering and Feeding
After planting, water the bulbs thoroughly to settle the soil and encourage root growth. Continue to water regularly, especially during dry spells. Fertilize the bulbs with a balanced fertilizer according to the package instructions. Avoid over-fertilizing, as this can lead to excessive foliage growth at the expense of flower production.
Caring for Your June-Planted Bulbs
Once your bulbs are planted, providing proper care is essential for ensuring healthy growth and abundant blooms.
Watering Regularly
Consistent watering is crucial, especially during dry periods. Monitor the soil moisture and water when the top inch feels dry to the touch. Avoid overwatering, as this can lead to bulb rot.
Providing Support
Tall-growing bulbs, such as gladioli and lilies, may require support to prevent them from bending or breaking under the weight of their flowers. Use stakes or other supports to provide stability.
Pest and Disease Control
Monitor your bulbs for signs of pests or diseases. Common pests include aphids, slugs, and snails. Use appropriate pest control methods to protect your plants. Bulb rot is a common disease that can be prevented by ensuring proper soil drainage and avoiding overwatering.
Deadheading and Maintenance
Remove spent flowers regularly to encourage continued blooming and prevent the formation of seed heads. Deadheading also helps to maintain the aesthetic appeal of your garden. After the foliage has died back in the autumn, cut it back to ground level. Some bulbs, such as gladioli and dahlias, may need to be lifted and stored indoors over the winter in colder regions.
Extending the Bloom Season: Successional Planting
To enjoy a continuous display of flowers throughout the summer, consider successional planting. This involves planting bulbs in stages, two to three weeks apart, to stagger the bloom times. This technique is particularly effective with gladioli and dahlias, allowing you to enjoy their vibrant flowers for an extended period.
Planning Your Successional Planting
Plan your successional planting schedule by dividing your bulbs into groups and planting them at intervals of two to three weeks. Label each planting area with the planting date to keep track of your schedule.
Adjusting for Climate
Adjust your successional planting schedule based on your local climate. In cooler regions, you may need to shorten the intervals between plantings to ensure the bulbs have enough time to mature before the end of the growing season.
Planting bulbs in June in the UK is definitely possible, particularly with careful planning and the right choices of bulb. With the proper approach, you can extend your garden’s bloom season and enjoy a colourful display throughout the summer. Remember that focusing on selecting appropriate varieties, ensuring good drainage, and consistent care are the key to success. Don’t be afraid to experiment and discover which bulbs thrive best in your garden!
Can I plant bulbs in June in the UK?
Yes, you can! While the prime bulb planting season in the UK is autumn for spring-flowering bulbs, June is a fantastic time to plant summer-flowering bulbs. These bulbs, unlike their spring counterparts, thrive when planted in warmer soil and will bloom later in the summer and into autumn, adding vibrant colour to your garden when many spring blooms have faded.
It’s essential to choose the right types of bulbs for June planting. Opt for summer-flowering varieties like Gladioli, Lilies, Dahlias (although technically tubers, they’re often treated as bulbs), Begonias, and Crocosmia. Ensure the bulbs are firm and healthy, free from signs of rot or disease, for the best chance of success. Proper soil preparation and watering are also crucial for establishing these summer bloomers.
What types of bulbs should I plant in June in the UK?
The best bulbs to plant in June in the UK are those that flower during the summer months. This includes popular choices such as Gladioli, which offer tall, striking flower spikes in a variety of colours. Lilies are another excellent option, known for their elegant blooms and fragrant aroma, while Dahlias (technically tubers) provide a long-lasting display of colourful flowers.
Other good choices for June planting include Begonias, which are perfect for containers and hanging baskets, and Crocosmia, with its vibrant, fiery orange and red flowers that attract hummingbirds. When selecting bulbs, always check that they are firm and healthy, avoiding any that feel soft or show signs of mould or damage. Also, consider the specific needs of each bulb type in terms of sunlight and soil drainage.
How do I prepare the soil for planting bulbs in June?
Proper soil preparation is key to successful bulb planting in June. Start by clearing the planting area of any weeds, grass, or debris. Then, dig over the soil to a depth of at least 20-30 cm (8-12 inches) to loosen it up and improve drainage. Incorporate plenty of well-rotted organic matter, such as compost or manure, to enrich the soil and provide essential nutrients for the bulbs.
If your soil is heavy clay, consider adding grit or horticultural sand to improve drainage and prevent the bulbs from rotting. If the soil is very sandy, the organic matter will help retain moisture. Before planting, level the soil surface and lightly firm it down. A well-prepared soil will provide the ideal conditions for the bulbs to establish strong roots and thrive.
How deep should I plant bulbs in June?
Planting depth is crucial for bulb survival and flowering. As a general rule, plant bulbs at a depth of two to three times their height. This ensures that the bulbs are protected from extreme temperatures and have sufficient soil to support their growth. Refer to the specific planting instructions on the bulb packaging, as optimal depth can vary depending on the bulb type and size.
For example, larger bulbs like Gladioli and Dahlias may need to be planted deeper than smaller bulbs like Crocosmia. After planting, gently firm the soil around the bulbs to eliminate air pockets and water thoroughly. Label the planting area to remind yourself where you’ve planted them, and to avoid accidentally digging them up later.
How often should I water bulbs planted in June?
Watering is essential for bulbs planted in June, especially during dry periods. Immediately after planting, water the bulbs thoroughly to settle the soil and encourage root growth. Then, keep the soil consistently moist, but not waterlogged, until the bulbs start to sprout. Check the soil moisture regularly by inserting your finger into the soil.
During hot, dry weather, you may need to water the bulbs more frequently, perhaps every day or every other day. Once the bulbs have established themselves and are actively growing, you can reduce the watering frequency slightly. However, be sure to monitor the soil moisture and water whenever it feels dry to the touch. Avoid overwatering, as this can lead to bulb rot.
What kind of sunlight do summer-flowering bulbs need?
Most summer-flowering bulbs thrive in a sunny location, requiring at least six hours of direct sunlight per day. This helps them produce strong stems, vibrant flowers, and store energy for future growth. However, some bulbs, like Begonias, can tolerate partial shade, especially in hotter climates. Check the specific requirements of the bulbs you’ve chosen before planting.
If you are planting in a particularly hot area, consider providing some afternoon shade to protect the bulbs from scorching. This can be achieved by planting them near taller plants or structures that provide some dappled shade. In areas with less intense sunlight, ensure the bulbs are positioned to receive maximum exposure to the sun.
Are there any pests or diseases I should watch out for when planting bulbs in June?
Yes, there are a few pests and diseases to be aware of when planting bulbs in June. Slugs and snails can be a particular problem, especially for young shoots. Protect your bulbs by using slug pellets, copper tape, or other deterrents. Lily beetles can also attack lilies, so regularly inspect your plants for these bright red beetles and their larvae, and remove them by hand.
Bulb rot is another potential issue, often caused by overwatering or poorly drained soil. Ensure your soil has good drainage and avoid overwatering. If you notice any signs of rot, such as soft or mushy bulbs, remove them immediately to prevent the disease from spreading to other plants. Regularly inspecting your plants and taking preventative measures will help to keep your bulbs healthy and thriving.