Spring bulbs, summer bulbs
Spring bulbs, also referred to as hardy bulbs or perennial bulbs, should be planted in autumn (September and October) before the ground freezes so they flower in spring (April to June). Tulips, hyacinths and other perennial bulbs have that special characteristic of having a bulb or corm that can thrive underground over the winter. They're sold in garden centres starting in late August.
Plant summer bulbs, also referred to as annual bulbs or tender bulbs, in spring (May-June) so they ﬂower during the holidays (July to October). These can't survive in the ground in winter. They must therefore be dug up and kept inside until they are replanted early the following spring. They're sold in garden centers starting in April.
Plant your bulbs as soon as possible after you buy them. If needed, you can also keep them in a dark, cool dry place, although soft bulbs such as Fritillaries, Dahlias and Callas must be protected from drying out by being stored in sand or peat moss. It will need to be friable and aerated too, with a pH of six and a half.
- Loosen up the soil.
- Add a bit of Botanix shrimp compost and some bone meal or use a granular fertilizer for perennial bulbs.
- Make sure the soil is well drained but damp throughout growing and ﬂowering.
- Dig the planting hole to the desired depth, usually as deep as the length of two or three of the bulbs themselves. There are exceptions though. Some bulbs, like Tuberous Begonias, are better off closer to the surface.
- Drop in the bulb with the point facing up.
- Plant the bulbs in a zigzag pattern in groups of a given variety, a clump of 12 to 20 bulbs.
- Cover the bulbs with soil up to the surface and water generously.
- Bulbs in exposed areas need to be protected over the winter with a layer of organic mulch.
Pollination is important to maintain bloom quality. This enables the plant to flower longer. You can even leave spring bulbs where they are and they'll keep coming back year after year if the soil is sufﬁciently rich in nutritional requirements. To ensure that it is, add compost during planting or early in the season.
Systematically deadhead faded spring bulb ﬂowers and regularly deadhead annual bulbs to maintain the plants’ vigour. You must let foliage of spring bulbs yellow and dry on the plant, or they won't ﬂower the next year. This is an integral part of their photosynthesizing system that allows the plants to store energy for subsequent ﬂowering. Since summer bulbs are vulnerable to frost, they must be dug-up in the autumn and stored inside during the winter.
Every two or three years, once the leaves have died back and turned yellow, some bulbs, such as tulips, can be dug up, divided and replanted. This rejuvenates them and will give you years and years of blooms.
If you leave in the ground anemones, daffodils and scilla they will seed and produce lovely huge colonies over the years.
So many uses
Bulb plants will provide continuous ﬂowering from the time when the snow begins to melt until the late autumn frost. Like annuals and perennials, perennial bulbs are generally grouped according to their height, their colour and their flowering period.
Where to plant:
There is a recent trend towards planting bulbs in unexpected places as if they grew there by chance.
- at the foot of trees and bushes,
- among perennials and ground covers: with time, daffodils, anemones and scilla will form a whole carpet of colour.
- in the lawn: small early-blooming bulbs such as crocus and scilla go well out on the lawn, scattered in small irregular groups. They are really lovely under trees. They are easy to plant if you use a bulb a trowel.
- in annual ﬂower beds when they have finished blooming,
- on the edge of oriental gardens,
- in a rockery. Rock gardens are ideal for perennial bulbs.
- in ﬂower stands and pots, where space is at a premium, you can plant various bulbs at different levels, with the late ﬂowering bulbs on the bottom and the early ﬂowering ones on top. For example: (starting at the bottom) Ornamental Garlic, Tulip, Crocus, Daffodil, Grape Hyacinth, Winter Aconite.
For the first flowering in ﬂower beds, companion plant bulbs with perennials that have leaves able to camouﬂage the yellowing foliage of your bulbs after they ﬂower.
Plant for-get-me-nots and pansies in between your tulips. They will all bloom at the same time but they have different heights so you’ll achieve a sense a vertical volume.
Companion planting of spring bulbs and perennials: Daylily and Daffodil, Hosta and Tulip, Fritillaries and Female Ferns, Bearded Iris and Wildginger, Squill and Sea Thrift.
Bulbs for the edge of your pond: Fritillaria, Daffodil, Caladiums, Callas or Elephant Ears.
Bulbs that naturalize: Glory-of-the-snow, Crocus, Winter Aconite, Snowdrop, Squill and Daffodil.
Easy to grow: simply place its bulb on the water, and the Water Hyacinth will ﬂower. It's that easy.
Astonishing: the Fall Crocus’s autumnal blooms peeking out from the dead leaves will amaze you, and so will the crepe paper petals of the Persian Ranunculus.
Seminal: plant 10 squills and you'll soon have 1 000. They spread like butter. If you leave anemones, daffodils and scilla in the ground they will seed and produce lovely huge colonies over the years.
Original: the rufﬂed feathers of the Parrot Tulip, the Caladium’s spray-painted leaves, Giant Garlic’s impeccably globular umbels, Crown Imperial’s circle of carillons and its spidery halo, the Canna and its tropical giant look.