What are prepared hyacinth bulbs?

Prepared bulbs have been given a special heat treatment by the supplier to trick them into flowering earlier than normal. Only prepared bulbs, planted in September, will reliably flower indoors in time for Christmas.

How long does it take to force hyacinths for Christmas?

Prepared bulbs typically need about 10 weeks in a cool, dark place to root, followed by three to four weeks in a bright, cool room to flower, so planting in late September gives blooms by mid-December.

Can handling hyacinth bulbs irritate the skin?

Yes, the crystals in hyacinth bulb skin can cause itching, redness or a mild rash, sometimes called 'hyacinth itch'. Wear gloves when handling bulbs, especially if you have sensitive skin.

Can forced hyacinths be planted outside afterwards?

Yes, once flowering has finished and the risk of hard frost has passed, forced hyacinths can be planted out in the garden, where they will flower again in subsequent years, though usually with looser, more informal spikes.

Do hyacinths need to be lifted every year outdoors?

No, outdoor hyacinths can generally be left in the ground and will return for several years, though flower spikes may become smaller and looser over time compared with the first year.

Why didn't my indoor hyacinth bulbs flower?

This is usually because non-prepared bulbs were used for indoor forcing, or the bulbs were not given a long enough cool, dark rooting period before being brought into the warmth and light.

How to Grow Hyacinths: UK Care Guide

Hyacinths (Hyacinthus orientalis) are prized for their dense spikes of intensely fragrant flowers, equally suited to bold spring borders or forcing indoors for a winter display. Plant outdoor bulbs in autumn in well-drained soil and full sun, or use specially "prepared" bulbs to force blooms indoors in time for Christmas.

Key takeaways

Outdoor hyacinth bulbs should be planted from September to November in sun and free-draining soil.
Only "prepared" bulbs will reliably flower indoors for Christmas; plant these in late September.
Indoor forcing needs a cool, dark rooting period of around 10 weeks before bringing bulbs into the light.
Wear gloves when handling bulbs, as the skin can cause irritation known as "hyacinth itch".
Forced bulbs can be planted outdoors after flowering, where they will continue to flower in future years.

Attribute	Detail
Botanical name	Hyacinthus orientalis and cultivars
Plant type	Hardy spring-flowering bulb
Height & spread	20-30cm height; spread 8-10cm
Hardiness	RHS H6 (fully hardy outdoors)
Position	Full sun to light shade
Soil	Well-drained, fertile soil
Flowering period	March to April outdoors; December-January when forced indoors
Planting depth	10-15cm outdoors
Difficulty	Easy

Choosing varieties

Hyacinth cultivars come in a wide range of colours, all sharing the same dense, heavily scented flower spikes, and most are suitable for both garden borders and indoor forcing.

Variety	Flower colour	Best use	Flowering time
'Delft Blue'	Soft blue	Borders and forcing	March-April / forced Dec
'Pink Pearl'	Deep pink	Borders and forcing	March-April
'City of Haarlem'	Soft yellow	Borders	April
'Woodstock'	Deep burgundy-purple	Borders and pots	March-April
'Carnegie'	Pure white	Borders and forcing	March-April
'Blue Jacket'	Deep navy blue	Borders	April

When and where to plant

For outdoor displays, plant hyacinth bulbs from September to November in a sunny, sheltered spot with well-drained soil; heavy, waterlogged ground can cause bulbs to rot over winter. For indoor forcing, plant specially prepared bulbs in September so they are ready to flower by Christmas. For more seasonal bulb planting advice, see our seasonal guide.

How to plant (outdoors)

Choose firm, plump bulbs and discard any that are soft or damaged.
Plant at a depth of 10-15cm in beds, borders or containers.
Space bulbs around 10cm apart for a dense, uniform display.
Wear gloves when handling, as bulb skin can irritate sensitive skin.
Firm soil back over gently and water in if the ground is dry.

Indoor forcing timeline

To flower hyacinths indoors for Christmas, use only "prepared" bulbs, which have been heat-treated to break their natural dormancy early. Plant them in September in bulb fibre or compost in bowls without drainage holes, leaving the bulb tips just showing above the surface. Place the bowls somewhere cool, dark and frost-free, such as a shed, garage or cupboard, for around 10 weeks, checking occasionally that the compost stays lightly moist. Once shoots reach about 3-5cm and are pale yellow, gradually introduce the bowls to a cooler, brighter room before moving to a warmer position once foliage has greened up; flowers typically follow three to four weeks later, giving blooms by mid-December if planted in late September.

Handling bulbs safely

The outer skin of hyacinth bulbs contains calcium oxalate crystals, which can cause an itchy rash sometimes known as "hyacinth itch" or "daffodil itch" in sensitive individuals. Always wear gloves when planting or handling bulbs in quantity, and wash hands thoroughly afterwards, particularly before touching your face.

Aftercare and feeding

Outdoor hyacinths benefit from a balanced liquid feed after flowering to build up bulbs for the following year. Indoor forced bulbs should be kept in bright, cool conditions once flowering, away from direct heat sources such as radiators, which shorten flowering life considerably. Water forced bulbs sparingly, avoiding letting the base of the bulb sit in standing water.

What to do after flowering

As with other spring bulbs, leave foliage to die back naturally after flowering rather than cutting or tying it, as this feeds the bulb for future growth. Deadhead spent flower spikes to prevent seed formation, but keep leaves intact until they yellow completely.

Moving forced bulbs outdoors

Once indoor forced hyacinths have finished flowering, allow the foliage to die back naturally indoors or in a sheltered cold frame, then plant them out in the garden once the threat of hard frost has passed. They will continue to flower in following years, though spikes are usually looser and less uniform than in their first forced season.

Growing in pots

Hyacinths are well suited to pots and window boxes outdoors, using peat-free multi-purpose compost with added grit for drainage. Plant bulbs closely together for a fuller display and protect pots from the worst winter wet by raising them on pot feet.

Common problems

Problem	Symptom	Fix
Skin irritation	Itching or rash after handling bulbs	Wear gloves; wash hands after handling
Bulb rot	Soft, discoloured bulbs, no growth	Improve drainage; avoid overwatering forced bulbs
Flopping flower spikes	Heavy flower heads bending stems, especially indoors	Keep forced bulbs cool and in bright light; stake if necessary
Failure to flower indoors	Only leaves appear, no flower spike	Use prepared bulbs and ensure a full cool, dark rooting period

Month-by-month care calendar

Month	Task
September	Plant prepared bulbs for indoor forcing; plant outdoor bulbs from now
October-November	Continue planting outdoor bulbs; keep forced bulbs cool and dark
December	Forced bulbs flower indoors; keep cool and out of direct heat
March-April	Outdoor bulbs flower; feed after flowering
May onwards	Leave foliage to die back naturally; move spent forced bulbs outdoors

How to Grow Hyacinths: Complete UK Care Guide