10 Summer Bulbs for Balconies and Gardens

After winter, everything can look grey and empty – but one simple spring planting trick can turn dull corners into a summer firework display.

Anyone choosing the right flower bulbs between February and the end of May can look forward to a surprise a few months later: lush beds, fragrant containers on the balcony and colours that almost feel like a holiday. Better still, many of these bulbs return year after year when treated properly.

Why flower bulbs planted now save the summer

When people think of bulb plants, tulips and daffodils planted in autumn usually come to mind first. However, these alone are not enough for a spectacular high-summer display. Summer-flowering bulbs and tubers – from dahlias to mimic flowers – take over when spring blooms have long faded.

Summer bulbs planted in spring will flower in the same year and can last for several seasons.

The reason is simple: by the time these plants reach the shops, they have usually already completed their cold period. Plant them in free-draining soil as soon as frost is no longer expected, and they will begin growing strongly just a few weeks later.

Good drainage is essential, particularly in soil that becomes waterlogged in winter. Standing water causes tubers to rot. In pots, use a drainage layer of expanded clay or gravel; in beds, improve heavy soil with sand or fine grit.

How to plant bulbs correctly

Whether you are handling traditional bulbs, tubers, rhizomes or corms, the basic rules are the same.

• Plant the bulb or tuber with the pointed end facing upwards.
• Dig a hole deep enough to cover it with soil to roughly twice the bulb’s height.
• Firm the soil gently so that no air pockets remain.
• Water after planting to help roots establish quickly.
• In containers: add a drainage layer at least two finger-widths deep at the bottom.

In borders, plant these varieties in groups wherever possible. Individual plants can easily disappear visually, while clusters of three, five or seven make a far stronger impact and create an almost professionally designed garden look.

The 10 most important summer bulbs for balconies and gardens

These ten varieties cover almost every situation, from a shady city balcony to a sun-baked terrace.

1. Amaryllis for exotic summer flowers

Most people know amaryllis as a Christmas windowsill plant. Yet outdoor varieties are available too: they need a warm, sunny spot and well-drained soil. Their huge, exotic flowers sit on sturdy stems and immediately draw attention.

In mild areas, the bulbs can remain in the ground, although lifting them before the first frost is usually worthwhile. Stored somewhere dry and cool, they will perform again the following year.

2. Anemones as delicate clouds of bloom

Anemones produce fine, almost floating flowers on short stems. They are ideal along the front of a border, between perennials or as a loose planting beneath shrubs. Planted in groups, they form a true carpet of flowers.

They prefer humus-rich, fairly loose soil and partially shaded positions. A covering of leaves protects them in severe winters, while in milder areas they can remain in the ground without difficulty.

3. Tuberous begonias for difficult shady corners

Tuberous begonias are the answer for north-facing balconies and dark courtyard corners. They flower tirelessly even without direct sunshine. Their densely double blooms can look almost like miniature roses.

After the first cold spell, store the frost-sensitive tubers dry in a box, lightly covered with soil or sawdust. Plant them again in pots or beds the following spring.

4. Caladiums for colourful jungle flair

Caladiums have rather inconspicuous flowers, but their enormous leaves in white, pink, red and green are their main attraction. This makes them living design features for partially shaded terraces or courtyards.

Their tubers need warmth, so do not plant until nights are genuinely mild. For winter storage, keep them dry at around 21 to 24 degrees, such as indoors or in a warm cellar.

5. Cannas as tropical giants

With their large leaves and vivid flower spikes, cannas add a touch of the Caribbean to containers and borders. They enjoy full sun, cope well with heat and appreciate plenty of water and nutrients.

The rhizomes are easily damaged by frost, so lift them in autumn, brush off most of the soil and store them frost-free. They can even be divided in spring, allowing you to increase your own stock with little effort.

6. Crocosmias for fiery colour accents

Crocosmias, also known as montbretias, produce vivid orange or red flowers on graceful, gently arching stems. They suit naturalistic borders and attract butterflies and bees.

In mild locations, they can survive winter in the ground beneath a thick layer of leaves or mulch. In harsher areas, it is better to lift the corms and protect them as you would dahlias.

7. Dahlias as the stars of summer borders

Dahlias come in countless forms: tiny and simple, enormous and double, in pastel shades or striking bright colours. They are among the most dependable repeat-flowering plants from July into autumn.

Dahlias provide flowers for the vase for weeks – regular cutting encourages fresh blooms.

Plant the tubers in the ground or in pots only once the danger of frost has passed. Lift them in autumn, allow them to dry and store them at 1 to 7 degrees, for example in a cool cellar. Crucially, do not forget the labels, so you still know which variety is which in spring.

8. Gladioli for dramatic cut flowers

Gladioli are classic flowers for tall bouquets. By planting fresh corms every two weeks, you can extend the flowering period well into late summer.

They prefer a sunny, sheltered position because their long stems can snap easily in the wind. Taller varieties benefit from a support cane. Lift the corms after the first frost and store them somewhere dry.

9. Lilies for fragrance and elegance

Lilies bring an elegant touch to a border. Many varieties have a powerful scent, some almost intoxicatingly so. They grow equally well in pots and beds, provided the soil stays loose and free-draining.

The neck of the bulb should never sit in water. It is best to plant lilies slightly deeper and apply a loose mulch layer across the surface. Most lilies come through winter without lifting as long as the site is not excessively wet.

10. Tuberoses for the evening terrace

Tuberoses are not especially eye-catching at first – until their scent becomes noticeable in the evening. Their white flowers release an intense fragrance that is particularly effective beside seating areas or paths.

They require warm positions and light soil. Lift the tubers in autumn, dry them thoroughly and keep them frost-free.

Which location suits which bulb?

The right combinations can create a varied display even in the smallest space.

How bulbs survive for many years

If you do not want to buy new plants every year, correct autumn handling is key. Varieties from warmer regions, including dahlias, cannas, tuberous begonias, caladiums and tuberoses, cannot tolerate severe sub-zero temperatures.

• Lift them before the first hard frost.
• Shake off loose soil, but do not wash it away.
• Leave them to dry for several days in an airy, dry place.
• Then store them in crates or cardboard boxes with a little dry growing medium.
• Keep them in a dark, frost-free and fairly cool place.

In mild wine-growing areas, many amateur gardeners take the chance of leaving dahlias and similar plants in the ground with a thick mulch layer. In colder climates, lifting is worthwhile; otherwise, losses in spring can be substantial.

Practical tips for small spaces and balconies

Even without a garden, you can stage the entire display in pots. Large containers measuring 30 to 40 centimetres across offer sufficient room for a combination of three to five bulbs plus companion greenery, such as low grasses or mat-forming perennials.

A simple but effective mix for a city balcony:

• At the back: one canna or tall dahlia as a focal point.
• In the middle: two gladioli or lilies for vertical lines.
• At the front: tuberous begonias or anemones as a colourful edge.

Regular watering and a little liquid feed every two weeks will reward you with flowers for months. Pots dry out particularly quickly on covered balconies, so it is worth setting a watering-can reminder in your calendar.

What many people underestimate about summer bulbs

A few terms repeatedly cause confusion. Tubers, bulbs and rhizomes can blur together in everyday use. For practical purposes, one principle is enough: anything that needs lifting from the ground in autumn should be stored dry and frost-free. When planting, avoid setting them too deep, prevent waterlogging and water thoroughly after planting.

Anyone choosing fragrant varieties such as lilies and tuberoses should also consider their neighbours: the intense scent is not to everyone’s taste. In that case, position a container so the fragrance spreads more towards your own seating area than the neighbouring balcony.

The display becomes especially interesting when different flowering times are combined cleverly. Early anemones, mid-season dahlias and late-flowering gladioli can keep a border lively from June to October. With a little planning, just a few square metres can become a summer garden that is almost unrecognisable.