Horticulture Magazine

9 Bulbs To Plant In Spring For Flourishing Gardens

white zantedeschia aethiopica flower

Bulbs are often planted in the autumn to flower in spring, but there are many bulbs that can be planted in spring that will flower and give a stunning display, only a few months later in summer.

Mostly originating from warmer climates, they tend to need full sun to flower well and can provide some much needed colour in the garden, when a lot of plants have past their best.

Bulbs are easy to grow and care for and when discussed often encompass corms, tubers and rhizomes, which are generally planted in a similar way and will be covered in this guide as well.

1. Dahlias

various coloured dahlia flowers in a wicker basket

Dahlias are possibly one of the most stunning plants available to grow here in the UK and are often a firm favourite of gardeners.

They can flower, with regular deadheading from mid-summer onwards, often until the first frosts in November.

Available in a huge array of colours and sizes, they are equally happy when grown in a pot or container or directly in the ground. They are also very popular to grow as cut flowers, as they often grow on long stems and have a long vase life.

Dahlias originate from Mexico, where they are the country’s national flower. Hence, it is no surprise that they prefer as much sun as they can get, a south or west-facing and sheltered aspect is ideal.

From classic whites to vibrant pinks, oranges and reds and every colour in between, dahlias are obtainable in a multitude of shapes and sizes.

From simple single varieties, ball and pom pom, to cactus and dinnerplate, which can be as large as their name suggests, there is one to suit every garden, balcony or terrace.

However, beware, as once you’ve grown one dahlia there is a huge temptation to grow more!

2. Gladioli

upright gladioli blooms in purple, pink and green

When thinking of summer flowering bulbs, gladioli are often top of the list and for good reason. Also known as sword lilies due to their slender, pointed foliage, they provide great structure and style in all manner of colours during the summer months.

Grown from corms and planted in spring, they are easy to care for and grow well either directly in the ground or in pots and containers.

Gladioli require full sun to bloom well, but can cope with some shade. Originating from South Africa they are part of the Iridaceae family and are now grown all over the world.

Gladioli do best in a moist, but well-drained soil and can be left in the ground to overwinter in the south of the UK, but may need to be lifted and stored in colder parts of the country.

3. Lilies

Pink Asiatic lilies

Grown for their large trumpet shaped flowers and incredible scent, lilies look equally stunning when grown in the ground or in containers. From pink and white to orange and red, lilies are available to buy in a wide range of colours.

Oriental and Asiatic are two of the most commonly grown types here in the UK, often sold as bulbs that can be planted in the autumn or spring.

Both varieties prefer full sun, although oriental lilies grow best in ericaceous soil, whereas Asiatic varieties thrive in alkaline or more neutral soil.

Often grown in pots, they can then be moved to their pride of place when in flower and moved once finished, ready to store in an unheated greenhouse or cold frame over winter.

4. Crocosmia

orange crocosmia x crocosmiiflora flowers in bloom

Crocosmia, or montbretia as they are also known, can provide some much-needed colour in the garden late in the summer, when many plants have gone over. Available in red, orange and yellow, their graceful flowers contrast spectacularly against their bright green foliage.

Grown from corms, crocosmias originate from South Africa and grow best in a fertile and moist soil in full sun. Crocosmia will tolerate most soils, but do not like to be allowed to dry completely out which can stunt their growth and limit their flowering potential.

Crocosmia can spread over time, but clumps can be kept to a manageable size by division, or simply by growing in containers.

5. Polianthes

White Polianthes tuberosa

Polianthes are sometimes known as tuberose and produce elegant white or pink scented flowers during mid to late summer. Polianthes look great either planted in pots or in drifts in the borders.

Originally from Mexico, they require full sun and a minimum temperature of 15°C and are most suited to being grown in a conservatory or greenhouse or on a sheltered terrace.

Perhaps the most widely grown variety here in the UK is Polianthes tuberosa ‘The Pearl’, with its highly scented double white flowers it really is worth trying.

Classed as H2 on the RHS hardiness rating, polianthes tubers can survive cold temperatures, but will not survive being frozen, thus are best lifted and stored over winter.

6. Freesias

a bouquet of freesia flowers in various colours

Freesias are very popular here in the UK for their use as a cut flower. Available in colours including purple, orange, yellow and white they look stunning in a vase and are accompanied with a sweet scent.

Grow from corms and originally from South Africa, freesias are not hardy and can be planted either in autumn for growing indoors or spring for growing outdoors.

If planting outside, only plant the corms after the last chance of frost has passed, which is usually late May or June. Freesias like warm conditions, but must be grown in free-draining compost or else they tend to rot, especially when left in waterlogged or wet soils.

In warmer parts of the UK, the corms can be potentially left in the ground to overwinter if protected by a good layer of mulch, but elsewhere will need to be lifted and stored over the coldest months.

7. Agapanthus

blue agapanthus flowers

Agapanthus or the African Lily as they are also known, are astonishingly beautiful perennials, which can be either deciduous or evergreen. Grown for their stunning white, blue or purple flowers which tower above their green foliage on tall straight stems.

Perfect for containers, they can also be grown directly in the ground, but they do require full sun and free-draining soil.

Being drought-tolerant, agapanthus are well suited to gravel and coastal gardens as they can tolerate the salty air, but need to be watered well whilst getting established in their first year.

Deciduous agapanthus are usually the most hardy and can be left in the garden to over winter, however most even green varieties will need to be moved to a greenhouse to ride out the winter.

Available as potted plants or rhizomes, they are best planted in spring as the soils warms up.

Agapanthus can cope with a little shade, but if placed in too much shade their flowering can be dramatically reduced.

Agapanthus tend to grow best if their root system is restricted, which is why they can do so well in a container or pot and be moved to a prominent position when looking their best.

8. Calla Lilies

calla lilies in full bloom

The Calla lily, or arum lily, is strangely not an actual lily, but is part of the zantedeschia genus instead.

Originally from South Africa, they produce exotic looking flowers and come in a wide range of colours and can be grown indoors or outdoors.

Available as rhizomes, they are tender and need to be overwintered out of the cold.

Preferring a sunny site, calla lilies will cope with partial shade and need to be shaded from the strongest midday sun, which can scorch them.

In spring, calla lilies need to be started off indoors until all risk of frost has past, after which and when the soil has warmed up, they can be grown in the ground or in containers outdoors.

Calla lilies are hungry plants and require a rich fertile soil, a high nitrogen feed in spring and then a high potassium feed, such as a tomato feed, once flowering begins.

9. Begonias

tuberous begonia plants in pink, red, orange, white and yellow

Begonias can have a bit of a reputation as being a bit old fashioned, but either way they can provide continuous colour throughout the summer, thrive in partial shade and are thus still a popular bedding plant.

Begonias are available as either tuberous or fibrous varieties and being tender are often grown as annuals here in the UK.

Tuberous begonias are available from early spring and require starting off in pots indoors until after all risk of frost has past, after which they can be hardened off before planting outside.

Tuberous begonias are hungry plants and require fertile soil and once planted out, a weekly high potassium feed throughout the summer.

Tuberous varieties are often treated as annuals, however in October once their foliage has begun to die back, they can be cut down to 5cm, and their tubers lifted to store over winter until the following spring.

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