Fertilising guide
How to fertilise Queen of Night Tulip (Tulipa gesneriana 'Queen of Night')— schedule & NPK
Also called Queen of Night Tulip, Black Tulip.
More about queen of night tulip
About Queen of Night Tulip
Tulipa gesneriana 'Queen of Night' · also called Queen of Night Tulip, Black Tulip · flowering
Tulipa 'Queen of Night' is an iconic late-season single late tulip bearing deep maroon-black, satiny flowers on tall 60 cm stems in mid-to-late spring. One of the darkest tulips available, it makes a dramatic statement in borders and cut-flower arrangements. Best treated as an annual in UK gardens; requires cold vernalisation for reliable bloom.
Growth habit: Bulbous geophyte; upright single stems, non-branching; typically grown as an annual in UK cultivation
What fertiliser queen of night tulip actually wants — and why
Queen of Night Tulip feeds for next year, not this one — the critical window is after flowering, while the leaves are still green and recharging the bulb.
A low-nitrogen, potassium- and phosphorus-leaning bulb fertiliser (something like 5-10-10) or bonemeal at planting. High nitrogen grows floppy leaves and rots stored bulbs.
For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for queen of night tulip: match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.
How often to feed queen of night tulip, and which months
Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For queen of night tulip:
Top-dress with a balanced granular fertiliser (e.g. Growmore) at bulb emergence in late winter. Apply a high-potassium liquid feed (tomato fertiliser) as buds form. If lifting and storing annually, feed is less critical but extends bulb viability for the following season. The rhythm: a bulb feed at planting, a light feed as leaves emerge, and — most important — a potassium feed straight after flowering while the foliage is still green and feeding the bulb. Never cut the leaves off early.
The dormant-season rule matters more than the exact interval: skip feeding entirely when queen of night tulip is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.
What strength to mix for queen of night tulip
Use the bulb-feed label rate for queen of night tulip; the timing (post-bloom, leaves still green) does far more for next year's display than the concentration.
Feeding always goes onto already-damp soil, never dry roots — water queen of night tulip first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the queen of night tulip watering schedule.
Signs you are over-feeding queen of night tulip
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for queen of night tulip:
- Tall, floppy, soft leaves that flop over (too much nitrogen).
- Soft or rotting bulbs lifted at the end of the season.
- Lush foliage but few or poor flowers.
Signs you are under-feeding queen of night tulip
- Progressively fewer or smaller flowers year on year ("going blind").
- Small, weak bulbs and thin foliage.
- Bulbs that fail to come back at all after a few seasons.
If the symptoms point at watering, light or roots rather than nutrition, the full queen of night tulip care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Bulbs are not container-flushed like houseplants; the equivalent is not over-feeding and lifting/dividing congested clumps of queen of night tulip every few years so they are not competing for nutrients.
Organic vs synthetic feeds for queen of night tulip
Organic options
Bonemeal worked in at planting plus a mulch of garden compost or well-rotted leaf-mould is the traditional, reliable approach for queen of night tulip. UK: blood, fish & bone or Westland Bulb Food; US: Espoma Bulb-tone or bonemeal.
Synthetic / liquid feeds
A proprietary bulb fertiliser at planting and a high-potash liquid (tomato feed) after flowering — UK: Westland Bulb Food then Tomorite; US: Miracle-Gro Shake 'n Feed Bulb or a bloom booster post-flower.
Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.
Fertilising queen of night tulip — frequently asked questions
What fertiliser does queen of night tulip need?
A low-nitrogen, potassium- and phosphorus-leaning bulb fertiliser (something like 5-10-10) or bonemeal at planting. High nitrogen grows floppy leaves and rots stored bulbs. Queen of Night Tulip feeds for next year, not this one — the critical window is after flowering, while the leaves are still green and recharging the bulb.
How often should I feed queen of night tulip?
Top-dress with a balanced granular fertiliser (e.g. Growmore) at bulb emergence in late winter. Apply a high-potassium liquid feed (tomato fertiliser) as buds form. If lifting and storing annually, feed is less critical but extends bulb viability for the following season. Top-dress with a balanced granular fertiliser (e.g. Growmore) at bulb emergence in late winter. Apply a high-potassium liquid feed (tomato fertiliser) as buds form. If lifting and storing annually, feed is less critical but extends bulb viability for the following season. The rhythm: a bulb feed at planting, a light feed as leaves emerge, and — most important — a potassium feed straight after flowering while the foliage is still green and feeding the bulb. Never cut the leaves off early.
What strength of feed for queen of night tulip?
Use the bulb-feed label rate for queen of night tulip; the timing (post-bloom, leaves still green) does far more for next year's display than the concentration.
What does over-feeding queen of night tulip look like?
Tall, floppy, soft leaves that flop over (too much nitrogen). Soft or rotting bulbs lifted at the end of the season. Lush foliage but few or poor flowers. Cutting or tying off the leaves of queen of night tulip as soon as the flowers fade is the great bulb mistake — the bulb recharges through those leaves for weeks afterward, and removing them early means a weak or blind display next year.
Should I flush the soil of queen of night tulip?
Bulbs are not container-flushed like houseplants; the equivalent is not over-feeding and lifting/dividing congested clumps of queen of night tulip every few years so they are not competing for nutrients.
Keep reading
- Queen of Night Tulip care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water queen of night tulip — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
- How to fertilise straw foxglove
- How to fertilise digitalis 'camelot cream'
- How to fertilise rusty foxglove
- All 6887 fertilising guides in the Growli library