Fertilising guide

How to fertilise Crocosmia × crocosmiiflora 'Jackanapes' (Crocosmia × crocosmiiflora 'Jackanapes')— schedule & NPK

Also called Jackanapes crocosmia, bicolour crocosmia.

More about crocosmia × crocosmiiflora 'jackanapes'

About Crocosmia × crocosmiiflora 'Jackanapes'

Crocosmia × crocosmiiflora 'Jackanapes' · also called Jackanapes crocosmia, bicolour crocosmia · flowering

A striking cormous perennial grown for its bicoloured, upward-facing flowers in bold orange-red and yellow, carried on wiry, arching sprays above sword-shaped, pleated foliage in mid to late summer. It forms spreading clumps from corms, brings hot late-season colour and pollinators to borders, and tolerates a wide range of soils given decent drainage.

Growth habit: Clump-forming cormous perennial spreading by stoloniferous corm chains; erect fans of sword-shaped leaves with arching, branched flower sprays held above the foliage.

Watch for — Poor flowering: Caused by congestion, deep shade, or overcrowded corms. Divide tight clumps, move into more sun, and feed with potash before bloom.

What fertiliser crocosmia × crocosmiiflora 'jackanapes' actually wants — and why

Crocosmia × crocosmiiflora 'Jackanapes' is a heavy-blooming flower with a big appetite — a regular high-potash feed through the season is what drives a long, dense display.

A high-potassium ("high-potash") flowering feed — tomato-style or a dedicated bloom/rose feed. Potassium powers flowering; a high-nitrogen feed gives you a leafy plant with disappointing bloom.

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 crocosmia × crocosmiiflora 'jackanapes': 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 crocosmia × crocosmiiflora 'jackanapes', 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 crocosmia × crocosmiiflora 'jackanapes':

Light to moderate. Apply a balanced general fertiliser or compost mulch in spring as growth begins; an optional high-potash feed before flowering supports bloom. Excess nitrogen produces lush leaf and fewer flowers. For a hungry bloomer that means feeding regularly — sparingly through the growing season — right through flowering across the main season (spring through early autumn), tapering as blooming ends.

The dormant-season rule matters more than the exact interval: skip feeding entirely when crocosmia × crocosmiiflora 'jackanapes' 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 crocosmia × crocosmiiflora 'jackanapes'

Follow the flowering-feed label rate for crocosmia × crocosmiiflora 'jackanapes', or half strength if feeding very frequently. These plants genuinely use the nutrients — under-feeding shows up fast as a thin display.

Feeding always goes onto already-damp soil, never dry roots — water crocosmia × crocosmiiflora 'jackanapes' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the crocosmia × crocosmiiflora 'jackanapes' watering schedule.

Signs you are over-feeding crocosmia × crocosmiiflora 'jackanapes'

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for crocosmia × crocosmiiflora 'jackanapes':

Lots of lush leaves but few flowers (too much nitrogen).
Scorched leaf edges and salt crust from too-strong or too-frequent feeds.
Soft, sappy growth prone to aphids and mildew.

Signs you are under-feeding crocosmia × crocosmiiflora 'jackanapes'

Sparse, small, short-lived flowers and pale foliage.
A tired plant that stops blooming early in the season.
Weak growth and poor repeat-flowering after the first flush.

If the symptoms point at watering, light or roots rather than nutrition, the full crocosmia × crocosmiiflora 'jackanapes' care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

Container-grown crocosmia × crocosmiiflora 'jackanapes' accumulates feed salts fast with frequent feeding — water until it drains each time and flush pots with plain water every few weeks to prevent scorch.

Organic vs synthetic feeds for crocosmia × crocosmiiflora 'jackanapes'

Organic options

A liquid comfrey or seaweed feed (naturally potassium-rich) plus compost or well-rotted manure as a mulch. UK: comfrey feed, organic Tomorite, or rose feed; US: Espoma Rose-tone or Neptune's Harvest. Feeds and improves soil.

Synthetic / liquid feeds

A high-potash flowering feed on a regular cadence — UK: Tomorite (Levington), Phostrogen or a specialist rose feed; US: Miracle-Gro Bloom Booster or a rose food. Fast, reliable bloom response.

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 crocosmia × crocosmiiflora 'jackanapes' — frequently asked questions

What fertiliser does crocosmia × crocosmiiflora 'jackanapes' need?

A high-potassium ("high-potash") flowering feed — tomato-style or a dedicated bloom/rose feed. Potassium powers flowering; a high-nitrogen feed gives you a leafy plant with disappointing bloom. Crocosmia × crocosmiiflora 'Jackanapes' is a heavy-blooming flower with a big appetite — a regular high-potash feed through the season is what drives a long, dense display.

How often should I feed crocosmia × crocosmiiflora 'jackanapes'?

Light to moderate. Apply a balanced general fertiliser or compost mulch in spring as growth begins; an optional high-potash feed before flowering supports bloom. Excess nitrogen produces lush leaf and fewer flowers. Light to moderate. Apply a balanced general fertiliser or compost mulch in spring as growth begins; an optional high-potash feed before flowering supports bloom. Excess nitrogen produces lush leaf and fewer flowers. For a hungry bloomer that means feeding regularly — sparingly through the growing season — right through flowering across the main season (spring through early autumn), tapering as blooming ends.

What strength of feed for crocosmia × crocosmiiflora 'jackanapes'?

What does over-feeding crocosmia × crocosmiiflora 'jackanapes' look like?

Lots of lush leaves but few flowers (too much nitrogen). Scorched leaf edges and salt crust from too-strong or too-frequent feeds. Soft, sappy growth prone to aphids and mildew. Using a high-nitrogen general feed on crocosmia × crocosmiiflora 'jackanapes' is the headline mistake — you grow a big leafy plant with few flowers. The second is simply under-feeding a genuinely hungry bloomer and getting a sparse, short display.

Should I flush the soil of crocosmia × crocosmiiflora 'jackanapes'?