The 10 most important summer bulbs for gardens and balconies

Winter has passed, the beds look bare and balcony planters feel drab. This is precisely the point at which it is decided whether summer will be merely “quite nice” or become a genuine explosion of colour. Certain flower bulbs and tubers are planted in spring, then produce fresh blooms for months – often for years to come. Better still, there is no need to start again from scratch every summer.

Why perennial summer bulbs are the best choice now

When people hear flower bulbs, they often immediately think of tulips or daffodils planted in autumn. Yet other plants are quietly preparing to make a real impact in July and August: bulbs and tubers that go into the ground in spring and take off in summer.

“The major advantage is that many of these summer bulbs are perennial and – with the right care – return for several seasons.”

Many of these plants have already received their required “cold period” while in storage. All they need is loose, well-drained soil. Depending on the region and risk of frost, the ideal planting window runs from late February to no later than the end of May. Missing this period means losing a great deal of flowering potential.

It is essential that water does not remain in the soil over winter. Waterlogging causes bulbs to rot. Loose soil helps in beds, while pots should always include a drainage layer of gravel or expanded clay.

How to plant spring bulbs for continuous summer flowering

Whether it is a bulb, tuber, rhizome or corm, the planting process is broadly the same. That makes the task less daunting for beginners and saves time.

• Prepare loose, free-draining soil and remove weeds.
• Dig a planting hole roughly two to three times as deep as the bulb’s height.
• Position the bulb with its pointed end facing upwards.
• Refill with fine soil and firm it gently.
• Water thoroughly so that the soil makes good contact with the bulb.

For pots, begin with a base layer of gravel, broken terracotta or expanded clay. This lets excess water drain away. Many summer-flowering plants actually grow better in containers, as warmth and nutrients can be managed more precisely.

The 10 most important summer bulbs for gardens and balconies

Careful planning now makes it possible to combine height, colour, fragrance and flowering time. These ten varieties are especially dependable, both in beds and containers.

Amaryllis for exotic giant blooms

Amaryllis, familiar from indoor pots, also makes a striking statement outdoors. Its impressive trumpet-shaped flowers sit on sturdy stems and thrive in sunshine and well-drained soil. It lends a tropical feel to a bed and quickly becomes an eye-catching feature on a patio when grown in a container.

Anemones as light clouds of flowers

Anemones form a carpet across the ground. Their delicate flowers dance in the breeze, making them ideal for edging beds or softly filling gaps between perennials. They look particularly natural in pots when several tubers are planted close together.

Tuberous begonias for difficult shady corners

Where little else is willing to flower, tuberous begonias step in. They prefer partial shade to shade and reward gardeners with abundant, almost uninterrupted blooms. Plant the tubers in pots or balcony planters in spring, then lift them again in autumn and store them somewhere frost-free.

Caladiums as foliage stars rather than flowering stars

Caladiums stand out less for their flowers than for their spectacular foliage. Their heart-shaped leaves, patterned in white, pink, red and green, appear almost painted. The tubers enjoy warm spots or sheltered urban balconies. For storage, keep them dry and relatively warm, for example indoors.

Cannas for a tropical holiday feel

Cannas add height to a bed. With their large leaves, sometimes marked with red, and vivid flower spikes, they evoke holidays in warm countries. They make ideal specimen plants in a sunny bed or a large container on a roof terrace. In colder regions, lift the rhizomes before the first hard frost and store them somewhere dark and cool.

Crocosmias for fiery accents of colour

The slim, arching flower stems of crocosmias carry dozens of small blooms ranging from orange to scarlet. They work well in naturalistic beds, attract bees and butterflies, and are fairly hardy, especially when given winter protection with leaves or mulch.

Dahlias – classics that return year after year

Dahlias are regarded as the queens of late-summer beds. Their forms range from simple, star-shaped flowers to perfectly round pompons. Plant the tubers after the last frosts. Gardeners who lift them again in autumn and store them frost-free can enjoy the same plants for many years.

Gladioli for graphic lines and cut flowers

Gladioli bring structure and order to a bed: their perfectly upright stems sit well among lower-growing plants. Planting new corms every two weeks creates a staggered display that continues well into late summer. They also last a long time in a vase as cut flowers.

Lilies for fragrance and elegance

Lilies are among the most classic summer-flowering plants. Many varieties have an intense perfume and are especially well suited to areas near seating or pathways. Their bulbs can often remain in the ground for several years, gradually forming larger clumps.

Tuberoses for evening fragrance on the patio

Tuberoses are less widely known, yet they are a top choice for fragrance lovers. Their white flowers release an intense scent particularly in the evening. Containers placed close to the patio are ideal, as this is where the fragrance can truly be appreciated. The tubers tolerate very little frost and need to be brought indoors in autumn.

Which position suits which bulb?

To help plants fulfil their potential, it is worth considering light levels and available space. Not every variety copes equally well with full sun or shady corners.

Plant	Position	Note
Cannas	Full sun	Large containers or the back of a border
Dahlias	Sun to partial shade	Feed regularly and provide support
Tuberous begonias	Partial shade to shade	Ideal for north-facing balconies
Caladiums	Bright shade	Only partly rain-resistant; choose a sheltered spot
Gladioli	Sun	Suitable for beds and cutting
Lilies	Sun, cool roots	Underplanting with ground cover is useful

How perennial summer bulbs survive winter

In mild regions, some varieties, such as crocosmias and certain lilies, can stay in the ground provided the soil is loose and not excessively wet. A thick mulch of leaves or bark pieces offers added frost protection.

Where winters are severe, a small autumn routine is worthwhile: lift the tubers of dahlias, cannas, tuberous begonias, caladiums and tuberoses after the first frost, allow them to dry, remove old foliage, and store them in boxes with a little dry soil or sawdust. Choose a frost-free, dark and well-ventilated location, such as a cool cellar.

Practical tips for low-maintenance gardeners and balcony owners

Anyone short on time should choose robust combinations: dahlias with crocosmias in a sunny bed, or tuberous begonias with anemones in partial shade. In large pots, lilies can be combined with low-growing summer flowers. This gives the planting a full, lively appearance from the outset.

Another useful trick is to mix in slow-release fertiliser at planting time. The bulbs will then have sufficient nutrients for weeks. Removing faded flowers regularly encourages fresh buds, turning one flush of blooms into a whole summer of flowers.

What beginners should know before buying summer bulbs

The term “perennial” does not automatically mean that plants can remain in the ground every winter. This is often possible in warmer areas with little frost, whereas colder locations require a little extra help. Those with only balcony planters can even benefit: containers are easy to move into a cellar or stairwell.

Things become especially interesting when favourite varieties are collected over the years. Many gardening enthusiasts swap tubers and bulbs with one another or try one or two new varieties every year. Not only does the plant collection grow, but so does experience – and summer will soon look anything but empty, even if everything is still bare in March.