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OrnamentalbulbousStraightforward

Hyacinth

Hyacinthus orientalis

Bought for the scent, which is overwhelming indoors and very good outside, and grown either as a forced bulb for midwinter or as a garden plant. The dense showroom spike is a one-year phenomenon: outdoors in the ground it relaxes into a looser, frankly more attractive plant in later years.

Position
Full sun or Partial shade
Water
low demand
Drainage
Free-draining
Grows to
20–30 cm × 10–15 cm
Hardiness
H6
Flowers
March and April
Difficulty
Straightforward

August

Nothing to do

No sowing, planting, harvesting or pruning window falls in August.

Coming next month: plant.

Hyacinth’s year

Resolved for United Kingdom (general). Every window is stored against a climate event rather than a date, so a late frost pocket runs later than the band shows. What else August calls for.

ActivityJFMAMJJASOND
PlantSeptember. October. November.
In flowerMarch. April.

Timing that travels

The band above resolves this plant's windows into months for one region. These are the windows themselves, stored against a climate event rather than a date — which is the form that survives being carried to a colder garden, a frost pocket, or next year.

Conditions it needs

Light
Full sun, Partial shade
Frost
Very hardy
Hardiness rating
H6 (RHS)
Grows best at
5–20 °C
Soil
Loam, Sandy, Chalky
Soil pH
6–7.5
Drainage
Free-draining
Water needs
low
Drought
good tolerance
Waterlogging
poor tolerance
Heat
moderate tolerance
Wind and exposure
moderate tolerance
Where these figures come from
LightSourced guidancemoderate confidence
  • Royal Horticultural Society: Hyacinth — position

Checked 2026-08-13

FrostSourced guidancehigh confidence
  • Royal Horticultural Society: Hyacinth — hardiness

Checked 2026-08-13

Hardiness ratingSourced guidancemoderate confidence
  • Royal Horticultural Society: RHS hardiness ratings

Checked 2026-08-13

Grows best atSourced guidancemoderate confidence
  • Royal Horticultural Society: Hyacinth — temperature

Checked 2026-08-13

SoilSourced guidancemoderate confidence
  • Royal Horticultural Society: Hyacinth — soil

Checked 2026-08-13

Soil pHSourced guidancemoderate confidence
  • Plant Finder — Missouri Botanical Garden: Hyacinthus orientalis — culture

Checked 2026-08-13

DrainageSourced guidancemoderate confidence
  • Royal Horticultural Society: Hyacinth — soil

Checked 2026-08-13

Water needsHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

DroughtHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

WaterloggingHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

HeatHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Wind and exposureHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

On your soil

Computed by comparing this plant's recorded requirements against each soil's recorded characteristics. A recorded horticultural fact overrides the comparison where GrowingHQ holds one.

SoilVerdictWhy
Heavy clayWorks, with one conditionHyacinth will crop on heavy clay, but one thing has to be dealt with first. It needs ground that drains, and this soil holds water. A plant that stays in the ground through winter with its roots in cold, saturated soil rots — which is what kills most of what fails on heavy ground, rather than the cold.Improve the drainage before planting — a raised bed, or bulky organic matter worked in over several seasons. Do not add sand to clay in small quantities; it makes the problem worse.
SandyPrefers this soilSandy suits Hyacinth as it stands: The pH suits it: it wants 6 to 7.5, and this soil is in that range. The free drainage is exactly what it wants. Sandy soil is among the soils it is recorded as suiting. It stands dry conditions better than most, which this soil will test.
Chalky and alkalinePrefers this soilChalky and alkaline suits Hyacinth as it stands: The free drainage is exactly what it wants. Chalky soil is among the soils it is recorded as suiting. It stands dry conditions better than most, which this soil will test.
LoamPrefers this soilLoam suits Hyacinth as it stands: The pH suits it: it wants 6 to 7.5, and this soil is in that range. The free drainage is exactly what it wants. Loam is among the soils it is recorded as suiting. The soil holds moisture, which saves a great deal of watering.
SiltyPrefers this soilSilty suits Hyacinth as it stands: The pH suits it: it wants 6 to 7.5, and this soil is in that range. The free drainage is exactly what it wants. The soil holds moisture, which saves a great deal of watering.
Peaty and acidWorks, with one conditionHyacinth will crop on peaty and acid, but one thing has to be dealt with first. It needs ground that drains, and this soil holds water. A plant that stays in the ground through winter with its roots in cold, saturated soil rots — which is what kills most of what fails on heavy ground, rather than the cold.Improve the drainage before planting — a raised bed, or bulky organic matter worked in over several seasons. Do not add sand to clay in small quantities; it makes the problem worse.
Shallow over rockPrefers this soilShallow over rock suits Hyacinth as it stands: The free drainage is exactly what it wants. Loam is among the soils it is recorded as suiting. It stands dry conditions better than most, which this soil will test.
Made ground and urban soilWorks, with one conditionHyacinth will crop on made ground and urban soil, but one thing has to be dealt with first. It needs ground that drains, and this soil holds water. A plant that stays in the ground through winter with its roots in cold, saturated soil rots — which is what kills most of what fails on heavy ground, rather than the cold.Improve the drainage before planting — a raised bed, or bulky organic matter worked in over several seasons. Do not add sand to clay in small quantities; it makes the problem worse.

Not sure which you have? Four hand tests will settle it.

Space and spacing

Mature height
20–30 cm
Mature spread
10–15 cm
Rooting depth
20 cm
Spacing
10–15 cm apart
Where these figures come from
Mature heightHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Mature spreadHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Rooting depthHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

SpacingSourced guidancemoderate confidence
  • Royal Horticultural Society: Hyacinth — spacing

Checked 2026-08-13

How far apart to plant hyacinthThree hyacinth plants drawn in a row at their recorded spacing of 10–15 cm between plants. The spacing is drawn to scale against a one metre rule; the plants themselves are symbols rather than scale drawings, so the distance between them is the part to read.10–15 cm
Measured centre to centre. Plants set closer than this compete for light and water long before they look crowded, and the crowding cannot be undone once they are in.

In a container

Minimum volume
2 litres or more
Minimum depth
15 cm
Where the container figures come from
Minimum volumeHorticultural consensusmoderate confidence
  • Royal Horticultural Society: Bulbs in containers

Checked 2026-08-13

Minimum depthHorticultural consensusmoderate confidence
  • Royal Horticultural Society: Bulbs in containers

Checked 2026-08-13

Most hyacinths are grown in a pot rather than a bed, and prepared bulbs for indoor flowering are a specific job: pot in September, keep them cold and dark at around 9°C for ten weeks until the shoots are a few centimetres tall, then bring them into gentle warmth. Brought in too early they flower down among the leaves; kept too warm too soon they produce leaf and a stunted spike.

Habit and ultimate size

What the plant becomes, rather than what it is when you buy it. The gap between the two is where most planting mistakes live.

In a container
Good in a container long-term
Where these figures come from
In a containerHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Bulb, corm, rhizome and tuber comparedFour underground storage organs drawn in section at the same scale. A true bulb is layered scales around a growing point on a flat basal plate, and multiplies by offsets that pull apart by hand. A corm is a solid swollen stem base with a bud on top, the previous year's spent corm beneath it and small cormlets at its sides. A rhizome is a horizontal swollen stem that sits at soil level with roots below and a growing point at one end, and must not be buried. A tuber is a swollen stem with growth buds scattered over its whole surface and no basal plate, so a cut piece without a bud on it cannot grow.True bulbbasal plateDaffodil, tulip, lilyPull offsets apart by hand.Cormspent corm below, cormlets asideCrocus, gladiolus, crocosmiaReplaced yearly by a new one on top.Rhizomesoil level — top stays exposedBearded irisCut with a knife. Must not be buried.Tuberbuds scattered, no basal plateCyclamen, potatoA cut piece without a bud will rot.
All four are sold as 'bulbs'. The differences are internal, which is why they are drawn rather than photographed — and each one changes what you physically do with the thing in your hand.
Storage organ
True bulb
Survives winter in the ground
Yes — plant once and leave it
Planting depth
10–15 cm
Naturalises
Stays where it is put
Where these figures come from
Storage organSourced guidancehigh confidence
  • Royal Horticultural Society: Hyacinthus orientalis — propagation

Checked 2026-08-13

Survives winter in the groundSourced guidancehigh confidence
  • Royal Horticultural Society: Hyacinthus orientalis — hardiness

Checked 2026-08-13

Planting depthSourced guidancemoderate confidence
  • Royal Horticultural Society: Hyacinthus orientalis — planting depth

Checked 2026-08-13

NaturalisesHorticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Layered scales around a basal plate — an onion in cross-section. Multiplies by producing offsets alongside the parent, which can be pulled apart by hand when the clump is lifted.

How deep to plant a bulb, drawn to scaleEight geophytes drawn at one scale against a soil surface line, each at the depth the catalogue records for it. A bearded iris rhizome sits on top of the soil with only its roots buried. A cyclamen tuber and a nerine bulb are barely covered, at 2 to 3 centimetres, the nerine with its neck standing proud. Snowdrops and crocuses go at 8 to 10 centimetres, a daffodil at 10 to 15, a tulip at 15 to 20 and a lily deepest at 15 to 25 centimetres. Most sit at roughly two to three times their own height, and the shallow exceptions are shallow because the organ must bake in the sun to flower.soil surface5 cm10 cm15 cm20 cmBearded irison topon the surfaceCyclamen2 cmjust coveredNerine2 cmneck proudSnowdrop9 cmCrocus9 cmDaffodil13 cmTulip18 cmplant deepLily20 cmstem roots
Two to three times the bulb's own height is the working rule, and the four plants that break it are the four most often planted wrong. A bearded iris buried by mulch or a tidy neighbour will make leaves for years and never flower again.
After flowering. The dense showroom spike is a one-year effect produced by the grower. Left in the garden it relaxes into a looser, more graceful and arguably better plant, and it will not force again.
source

Horticultural consensusmoderate confidence

No external citation — see the evidence type above.

Checked 2026-08-13

Where and how you can grow it

Each way of growing is assessed separately, and “not assessed” is a real answer rather than a gap we have filled in with a guess.

MethodSuitabilityWhat it needs
Open groundWell suited
source

Sourced guidancemoderate confidence

  • Royal Horticultural Society: Growing method suitability

Checked 2026-08-13

Traditional dug bedWell suited
source

Sourced guidancemoderate confidence

  • Royal Horticultural Society: Growing method suitability

Checked 2026-08-13

Raised bedWell suited
source

Sourced guidancemoderate confidence

  • Royal Horticultural Society: Growing method suitability

Checked 2026-08-13

ContainerWell suited
source

Sourced guidancemoderate confidence

  • Royal Horticultural Society: Growing method suitability

Checked 2026-08-13

Growing it

  • ProtectionFor flowering indoors at Christmas, buy prepared bulbs and give them a full ten to twelve weeks somewhere completely dark and genuinely cold — under 9 °C — before bringing them into warmth. Cutting that period short is why forced hyacinths come up with a flower head jammed down among the leaves.
  • PlantingPlant forced bulbs out in the garden after flowering rather than throwing them away. They will not force again, and they settle down into perfectly good if looser garden hyacinths within a couple of seasons.
  • WateringOutdoors, water in once at planting and leave it to the weather. Hyacinths need a dry summer rest like the other Mediterranean bulbs, and a bulb sitting in wet summer soil softens and rots. Bulbs being forced for indoor flowering are a different job with a genuinely different rule: keep the compost barely moist and never wet. On a hyacinth glass, keep the water level just BELOW the base of the bulb rather than touching it. The roots reach down to find it, and a bulb sat in water rots before it flowers.
  • FeedingA forced hyacinth needs no feeding at all — everything it flowers with was packed into the bulb by the grower the previous summer, and nothing you add during flowering changes the display. What feeding does affect is whether the bulb is worth keeping afterwards. Plant it out in the garden when the flowers are over, feed with a high-potash feed while the leaves are still green, and let it die down; it will never force again and will not give that dense showroom spike, but it settles into a looser, longer-lived and arguably better garden plant.
Where this guidance comes from
ProtectionSourced guidancehigh confidence
  • Royal Horticultural Society: Hyacinths — forcing

Checked 2026-08-13

PlantingSourced guidancemoderate confidence
  • Royal Horticultural Society: Hyacinths — after forcing

Checked 2026-08-13

WateringSourced guidancehigh confidence
  • Royal Horticultural Society: Hyacinths — cultivation

Checked 2026-08-13

FeedingSourced guidancemoderate confidence
  • Royal Horticultural Society: Hyacinths — after forcing

Checked 2026-08-13

Safety and edibility

  • Contact hazardsensitised individualsHyacinth bulbs carry calcium oxalate crystals in the outer scales and are a well-documented cause of an itchy contact dermatitis among people who handle them in quantity — the trade calls it hyacinth itch.
    source

    Sourced guidancemoderate confidence

    • Royal Horticultural Society: Hyacinthus — bulb handling

    Checked 2026-08-13

    Wear gloves when planting a boxful, and wash your hands afterwards.

Sources for this page

GrowingHQ editorial synthesis · Plant Finder · Royal Horticultural Society

Each figure on this page carries its own citation, under the “where these figures come from” note in its section. Record last reviewed 2026-08-14.