Fertilising guide
How to fertilise Daylily 'Hyperion' (Hemerocallis 'Hyperion')— schedule & NPK
Also called Hyperion daylily, lemon yellow daylily, classic yellow daylily.
More about daylily 'hyperion'
About Daylily 'Hyperion'
Hemerocallis 'Hyperion' · also called Hyperion daylily, lemon yellow daylily · flowering
Hemerocallis 'Hyperion' is one of the most celebrated daylily cultivars of the 20th century, bearing large, lemon-yellow, fragrant blooms in mid-summer on tall elegant scapes. Raised in 1925, it remains a benchmark for grace and fragrance in the genus. Highly toxic to cats — all parts can cause acute, fatal kidney failure.
Growth habit: Vigorous clump-forming deciduous perennial with arching mid-green foliage
Watch for — Scape lodging: The tall scapes can blow over in exposed or windy gardens. Stake individually or use grow-through support frames; avoid high-nitrogen feeds that produce weak, elongated stems.
What fertiliser daylily 'hyperion' actually wants — and why
Daylily 'Hyperion' is feeding to flower, not to grow leaves — it needs a higher-phosphorus / specialist bloom feed, given little and often, to set and hold its display.
A higher-phosphorus "bloom" formula or a species-specific feed (orchid food, African violet food, or a tomato-style high-potash/phosphorus liquid). A high-nitrogen general feed gives you lush leaves and almost no flowers.
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 daylily 'hyperion': 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 daylily 'hyperion', 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 daylily 'hyperion':
Apply a balanced granular fertiliser (10-10-10) in spring. A single liquid bloom feed in early summer supports the tall scapes and the multiple branched buds. This vigorous, long-established cultivar does not require intensive feeding — avoid over-fertilising with nitrogen. The pattern that matters: feed little and often through active growth and budding — sparingly through the growing season — and ease right off during the rest period that triggers the next flush.
The dormant-season rule matters more than the exact interval: skip feeding entirely when daylily 'hyperion' 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 daylily 'hyperion'
Very dilute — quarter strength, the classic "weakly, weekly" approach for daylily 'hyperion'. These plants have fine roots that scorch easily and a steady trickle beats an occasional strong dose for flowering.
Feeding always goes onto already-damp soil, never dry roots — water daylily 'hyperion' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the daylily 'hyperion' watering schedule.
Signs you are over-feeding daylily 'hyperion'
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for daylily 'hyperion':
- Lush green leaves but few or no flowers (too much nitrogen).
- Brown, scorched leaf tips and edges — a classic fine-root burn.
- White salt crust on the medium or pot, and stalled buds.
- Bud blast: buds forming then shrivelling and dropping.
Signs you are under-feeding daylily 'hyperion'
- Sparse or no flowering despite good light and the right season.
- Smaller, paler new leaves and a generally weak, tired plant.
- Flowers that are smaller or fade faster than they should.
If the symptoms point at watering, light or roots rather than nutrition, the full daylily 'hyperion' care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Specialist and bloom feeds leave salts that scorch fine roots — flush daylily 'hyperion' thoroughly with plain water until it runs clear every 4-6 weeks in the feeding season, and always between feeds for orchids.
Organic vs synthetic feeds for daylily 'hyperion'
Organic options
Gentler options exist: a dilute seaweed feed (mildly potassium-rich) or worm-casting tea. UK: Westland seaweed, or a dilute tomato feed like Tomorite for bud-formers; US: Espoma Orchid! / Violet! or Neptune's Harvest. Lower burn risk, slower response.
Synthetic / liquid feeds
A species-matched bloom feed at quarter strength — UK: Baby Bio Orchid / African Violet food, or a high-potash Tomorite/Phostrogen for budding bloomers; US: Miracle-Gro Orchid or Bloom Booster, Schultz African Violet.
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 daylily 'hyperion' — frequently asked questions
What fertiliser does daylily 'hyperion' need?
A higher-phosphorus "bloom" formula or a species-specific feed (orchid food, African violet food, or a tomato-style high-potash/phosphorus liquid). A high-nitrogen general feed gives you lush leaves and almost no flowers. Daylily 'Hyperion' is feeding to flower, not to grow leaves — it needs a higher-phosphorus / specialist bloom feed, given little and often, to set and hold its display.
How often should I feed daylily 'hyperion'?
Apply a balanced granular fertiliser (10-10-10) in spring. A single liquid bloom feed in early summer supports the tall scapes and the multiple branched buds. This vigorous, long-established cultivar does not require intensive feeding — avoid over-fertilising with nitrogen. Apply a balanced granular fertiliser (10-10-10) in spring. A single liquid bloom feed in early summer supports the tall scapes and the multiple branched buds. This vigorous, long-established cultivar does not require intensive feeding — avoid over-fertilising with nitrogen. The pattern that matters: feed little and often through active growth and budding — sparingly through the growing season — and ease right off during the rest period that triggers the next flush.
What strength of feed for daylily 'hyperion'?
Very dilute — quarter strength, the classic "weakly, weekly" approach for daylily 'hyperion'. These plants have fine roots that scorch easily and a steady trickle beats an occasional strong dose for flowering.
What does over-feeding daylily 'hyperion' look like?
Lush green leaves but few or no flowers (too much nitrogen). Brown, scorched leaf tips and edges — a classic fine-root burn. White salt crust on the medium or pot, and stalled buds. Bud blast: buds forming then shrivelling and dropping. Using an ordinary high-nitrogen houseplant feed on daylily 'hyperion' is the headline mistake — you get a healthy-looking plant that simply refuses to bloom. The second is feeding through the rest period and breaking the dormancy cue it needs to set buds.
Should I flush the soil of daylily 'hyperion'?
Specialist and bloom feeds leave salts that scorch fine roots — flush daylily 'hyperion' thoroughly with plain water until it runs clear every 4-6 weeks in the feeding season, and always between feeds for orchids.
Keep reading
- Daylily 'Hyperion' care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water daylily 'hyperion' — 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 codonatanthus 'sunset'
- How to fertilise alsobia dianthiflora
- How to fertilise alsobia 'san miguel'
- All 11687 fertilising guides in the Growli library