10 Summer Tubers That Transform Your Garden by Midsummer

After winter, everything can look grey and bare – but a few unassuming tubers can transform your garden completely by midsummer.

Many window boxes and flower beds look bleak in spring, even though this is exactly the right time to plan for summer. Planting bulbs and tubers strategically from February to the end of May means that, just a few months later, you can enjoy an explosion of colour, fragrance and enormous blooms – whether you have the smallest balcony or a terraced-house garden.

Why planting bulbs and tubers now saves your summer

Bulbous plants are compact stores of energy. Their tubers, rhizomes or rootstocks already contain everything needed to produce leaves and flowers. All they require is warmth, light and a reasonably suitable position. Once established, they often flower reliably for several consecutive years.

“Anyone who plants between February and May can secure abundant flowers in the same summer – without a long wait.”

The key benefit is that many of these summer-flowering plants are perennials. Some can remain in the ground, while others need lifting in autumn, dry storage and replanting the following spring. That turns a one-off purchase into a lasting investment in flowers.

How to plant them properly: simple rules for full pots and beds

Whether you are planting a tuber, bulb or rhizome, the process is much the same for home gardeners: choose a spot, prepare the soil, plant at the correct depth and water it in. Well-drained soil is essential, especially soil that does not become waterlogged in winter. Standing water causes bulbs to rot.

• Planting time: roughly February to the end of May, depending on your area and the risk of frost
• Soil: loose and reasonably rich in organic matter, never permanently wet
• Planting depth: as a general guide, two to three times the height of the tuber
• Direction: point facing upwards, flatter side facing downwards
• After planting: firm the soil gently and water thoroughly

For containers, add a bottom layer of expanded clay, gravel or broken terracotta. This prevents waterlogged roots and helps them stay healthy. Tall plants such as dahlias or gladioli benefit from a supporting cane, particularly on exposed, windy balconies.

The 10 most important summer tubers for a completely new look

1. Amaryllis for exotic giant flowers

Amaryllis (Hippeastrum) is usually known as a winter houseplant. Yet in a container on a terrace or balcony, it produces the same huge trumpet-shaped flowers in summer – only outdoors. It enjoys sunshine and free-draining soil. Once flowering has finished, allow the foliage to die back; the bulb can then overwinter somewhere cool and dry.

2. Anemones for a delicate cloud of flowers

Anemones produce light, almost floating blooms above fine foliage. In beds, they work well as underplanting or as a relaxed flowering carpet. They prefer positions ranging from part shade to sun, along with humus-rich soil. In pots, they look particularly attractive when planted in groups.

3. Tuberous begonias for shady corners

Tuberous begonias are the answer for dark balconies and north-facing aspects. They flower continuously even without direct sun. Their fleshy tubers must not sit in wet soil, but the plants do need regular watering and a little liquid feed. Lift the tubers in autumn, dry them thoroughly and store them somewhere frost-free.

4. Caladiums as foliage stars

Caladiums are not grown primarily for their flowers, but for their spectacular leaves. White, pink, red or multicoloured, these plants bring a tropical feel to a shady border or partly shaded balcony. Their tubers need warmth and thrive in summer temperatures above 20°C. Keep them dry and warm over winter.

5. Cannas for a tropical holiday feel

Cannas look as though they belong beside a hotel pool in the south. They offer large leaves, bold flower spikes and intense colour. They like full sun and need plenty of water and nutrients. In mild areas, the rhizomes can stay in the ground beneath thick winter protection; otherwise, lift them in autumn and store them frost-free.

6. Crocosmias as glowing torches

Crocosmias produce orange or red flowers on long, arching stems. They are ideal for sunny beds and are best planted in groups of five to ten tubers. With a light covering of leaves, they survive winter outdoors in many areas. Their delicate form also makes them appealing for naturalistic gardens.

7. Dahlias as late-summer stars

Dahlias are among the most popular summer-flowering plants. There are varieties ranging from small pom-pom blooms to enormous cactus-like flowers. They need plenty of light, nutrient-rich soil and regular watering. Always lift the tubers in autumn, let them dry and keep them somewhere cool but frost-free.

8. Gladioli for elegant cut flowers

Gladioli grow into tall, straight stems lined with closely packed flowers. They are ideal for the vase. Planting fresh tubers every two weeks creates staggered flowering over many weeks. In colder locations, the tubers should be lifted in autumn; in mild areas, good winter protection is sufficient.

9. Lilies for fragrance and long-lasting flowering

Lilies are among the longest-lived bulbous plants. Once planted properly, they can remain in the garden for many years. Many varieties release an intense scent in the evening, making them ideal near patios. They prefer deeply cultivated soil and a sunny to partly shaded position, while their base should be kept more shaded.

10. Tuberoses for evening fragrance by the seating area

Tuberoses are still something of an insider tip. Their white flowers give off a very strong, sweet fragrance, especially in the evening. They are best planted in pots near seating areas so that the scent does not become overpowering. In autumn, keep the tubers dry and frost-free for winter.

Which position suits which plant?

The right location determines whether your tubers really thrive. Many species love direct sun, while others benefit from shade or partial shade.

Plant	Suitable position	Can it overwinter in the ground?
Cannas	Full-sun bed or large container	Only in very mild areas with protection
Dahlias	Sunny bed, south-facing balcony	No, always lift the tubers
Tuberous begonias	Partial shade to shade	No
Lilies	Sun to partial shade	Usually yes, in good soil
Gladioli	Sunny beds or containers	Only in warm areas with a covering

How to get your summer tubers through winter

Many home gardeners lose their tubers simply because they forget to bring them in. Spending a few minutes on them in autumn can save a great deal of money the following spring.

• Cut back plant material after the first frost
• Lift tubers carefully and remove loose soil
• Leave them to dry for several days in an airy, shaded place
• Store them in boxes with a little sand, sawdust or paper
• Choose a frost-free, fairly cool room and check regularly for rot

This care is particularly worthwhile for dahlias, cannas, tuberous begonias and tuberoses. The plants will reward you with even more vigorous growth the following summer.

Practical tips for small balconies and low-maintenance gardeners

If you have little time or only a tiny balcony, choose mixed containers: put one tall plant in the centre, surround it with lower-growing plants and add some trailing greenery. Just one pot can then become a complete focal point.

A popular combination for an urban balcony:

• one dahlia or canna as the centrepiece
• anemones or tuberous begonias as filler plants
• a few trailing pothos plants or other hanging plants around the edge

For an especially straightforward approach, use pre-fertilised compost and water every few days with a small watering can. Once established, many bulbous plants are remarkably robust.

How to combine colours and flowering times cleverly

With a little planning, your garden can flower continuously for weeks. For example, scatter early-flowering anemones among lilies and crocosmias. Plant gladioli in succession so that fresh flower spikes keep appearing. Also, never place strongly scented plants such as lilies and tuberoses directly beneath bedroom windows, as their fragrance may become too intense at night.

If you have children, plant tubers together and mark where each one is placed. This turns the garden into a small space for experimentation and demonstrates, almost incidentally, how an unremarkable lump in the soil becomes a spectacular flower. That is exactly what makes these plants so appealing: minimal effort, maximum visible impact in midsummer.