We think of These are fleshy, rounded, underground storage organs, usually sold and planted while dormant. Examples include daffodils, tulips, hyacinths, lilies, onions and garlic. The term is often used to cover other underground storage organs, including corms, tubers and rhizomes.
Perennials are plants that live for multiple years. They come in all shapes and sizes and fill our gardens with colourful flowers and ornamental foliage. Many are hardy and can survive outdoors all year round, while less hardy types need protection over winter. The term herbaceous perennial is used to describe long-lived plants without a permanent woody structure (they die back to ground level each autumn), distinguishing them from trees, shrubs and sub-shrubs.
Delicate
Fill the annoying gap between the tulips fading and the herbaceous perennials starting with Allium ‘Universe’ (ornamental onion). The heads really are enormous (20 cm in diameter) and are held on significantly tall stems. They can be planted in the middle of a sunny border where the emerging herbaceous plants will help to hide the allium’s fading leaves. The rich purple flowerheads flower in June. Height: up to 70cm. RHS hardiness rating: H5.
Exotic choices
These exotic and underrated South African bulbs certainly add interest to a sunny border and will excite admiring comments. Commonly known as pineapple flowers, Eucomis have a curious leafy topknot to the flowers. They are fully hardy when planted deeply in a sunny, well-drained position in rich garden soil. They require plenty of water when in full growth. Height: stems of up to 75cm tall, and racemes to 30cm long.
Eucomis bicolour
Add some drama to your summer garden with these unusual bulbs. Eucomis bicolour make an interesting addition to the front of a sunny border. The broad shiny leaves give rise to compact heads of cream flowers with attractive red markings. These are followed by expanded seed capsules which stay on the plant until the first frost. They can self seed and can be grown as a long lasting pot plant. If grown in a pot move into a Frost-free environments, such as a cool greenhouse or conservatory, have a nighttime minimum of 4°C (39°F). This is ideal for plants tolerant of low temperatures, but will not survive being frozen, such as tender plants being overwintered including pelargoniums; frost-tender rooted cuttings such as penstemon; and bedding plants in spring.
Eucomis ‘Pink Gin’
We all like a star in our gardens and ‘Pink Gin’ was the outstanding Gardeners often use the word variety when referring to a specific plant, but the correct botanical term is 'cultivar'. Whichever word you use, it means a distinctive plant or plants, given a specific cultivar name and usually bred to enhance certain characteristics, such as flower or fruit size, colour, flavour or fragrance, plant size, hardiness, disease resistance, etc. Additionally, it is worth knowing that, botanically, variety has another meaning - it refers to a naturally-occurring distinct plant that only has slight differences in its looks. For example, Malva alcea var. fastigiata differs from typical plants by having an upright habit.
Note: Eucomis ‘Pink Gin’ was awarded the RHS Recommended: Award of Garden Merit subject to availability at the time of the trial. At the moment, this plant may be difficult to source, but if you are lucky enough to get it, it would make a great addition to any garden.
Eucomis pallidiflora
Eucomis pallidiflora with its huge heads of green flowers looks as though it should be tender but is a reliable perennial. Despite its 1.5m stature, this bulb that really looks you in the eye, is best planted at the front of a border where it can receive full sun. Provided it receives plenty of water the display gets better each year. Height: 2m. RHS hardiness rating: H5.
White and whimsical
Also known as summer hyacinth, Galtonia candicans has little in common with short spring flowered hyacinths. The spikes carry up to 30 nodding waxy white bells which bloom in August. They are trouble free and make a dramatic statement at the edge of a border increasing gently every year. It is best to plant the bulbs in late spring in fertile, well-drained soil in full sun, although they will tolerate a little shade. They mix well with white cosmos and blue campanula. Height: 1.5m. RHS hardiness rating: H4.
Romantic
Lilium ‘Friso’ is one of the spectacular tree lilies. It has up to 10 or more large open white trumpet flowers with an intense maroon centre. It lives up to its name and eventually reaches a staggering 2.5m. It should be planted deeply in a rich soil in full sun and be left undisturbed to bloom in July/August. Excellent rising above penstemons or among roses. Height: up to 2.5m. RHS hardiness rating: H6.
Eye-catching
Mention the word crocosmia and everyone throws up their hands in horror. However, the magnificent new cultivars are far removed from the pesky montbretia, with outward facing flowers on well branched stems which flower for six weeks or more. These are the standout plants in the recent trial. Lift and divide every three to four years to maintain vigour. They prefer full sun and a soil that is not too dry.
Crocosmia ‘Bright Eyes’ ‘Walbreyes’
This vigorous new cultivar has well branched stems and a succession of open clear orange flowers with a dramatic scarlet eye. Crocosmia ‘BRIGHT EYES’ ‘Wallbreyes’ is very different and startling. The clumps flower for nearly six weeks from August to September. Height: 1.2m. RHS hardiness rating: H5.
Crocosmia ‘Hellfire’
Why not give the popular C. ‘Lucifer’ a run for its money? Living up to its name, Crocosmia ‘Hellfire’ is a true scarlet without any hint of orange, making this a vibrant stand-out in the garden in August. Height: 1m. RHS hardiness rating: H5.
Crocosmia ‘Limpopo’
Crocosmia ‘Limpopo’ have widely flaring orange flowers that have an extraordinary hint of pink suffusing them. Perfect to make a real splash in the front of a sunny border. They are in bloom from mid to late summer. Height: up to 75cm when in flower. RHS hardiness rating: H5.
Crocosmia ‘Paul’s Best Yellow’
This dramatic cultivar starts the season with its large arching sprays of upward facing flowers. Crocosmia ‘Pauls’s Best Yellow’ are shades of clear lemon yellow and truly make a splash when in bloom in late summer. Height: 60cm. RHS hardiness rating: H4.
