Fertilising guide

How to fertilise Nemesia strumosa 'Poetry Blue' (Nemesia strumosa 'Poetry Blue')— schedule & NPK

Also called Poetry Blue Nemesia, Blue Cape Jewels.

More about nemesia strumosa 'poetry blue'

About Nemesia strumosa 'Poetry Blue'

Nemesia strumosa 'Poetry Blue' · also called Poetry Blue Nemesia, Blue Cape Jewels · flowering

'Poetry Blue' is a compact South African Nemesia bearing masses of small two-lipped lavender-blue flowers over bushy foliage from late spring through summer. A cool-season bedding and container favourite, it flowers best in mild weather, likes sun with even moisture and rich soil, and reblooms strongly if trimmed back when the first flush tires.

Growth habit: Compact, bushy and upright-mounding, branching freely from the base to form a neat clump for bedding, edging and container fillers.

Watch for — Yellowing from drying out or alkaline soil: Leaves yellow when roots dry out or the soil is too alkaline. Maintain even moisture, use slightly acidic compost and feed regularly.

What fertiliser nemesia strumosa 'poetry blue' actually wants — and why

Nemesia strumosa 'Poetry Blue' 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 nemesia strumosa 'poetry blue': 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 nemesia strumosa 'poetry blue', 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 nemesia strumosa 'poetry blue':

The dormant-season rule matters more than the exact interval: skip feeding entirely when nemesia strumosa 'poetry blue' 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 nemesia strumosa 'poetry blue'

Follow the flowering-feed label rate for nemesia strumosa 'poetry blue', 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 nemesia strumosa 'poetry blue' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the nemesia strumosa 'poetry blue' watering schedule.

Signs you are over-feeding nemesia strumosa 'poetry blue'

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for nemesia strumosa 'poetry blue':

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 nemesia strumosa 'poetry blue'

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 nemesia strumosa 'poetry blue' care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

Container-grown nemesia strumosa 'poetry blue' 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 nemesia strumosa 'poetry blue'

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 nemesia strumosa 'poetry blue' — frequently asked questions

What fertiliser does nemesia strumosa 'poetry blue' 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. Nemesia strumosa 'Poetry Blue' 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 nemesia strumosa 'poetry blue'?

Feed every 1-2 weeks with a balanced liquid feed through the growing season, shifting toward high-potash to sustain flowering. Container plants are hungry; regular feeding keeps growth lush and prevents premature yellowing and bloom decline. Feed every 1-2 weeks with a balanced liquid feed through the growing season, shifting toward high-potash to sustain flowering. Container plants are hungry; regular feeding keeps growth lush and prevents premature yellowing and bloom decline. For a hungry bloomer that means feeding regularly — every 1-2 weeks — right through flowering across the main season (spring through early autumn), tapering as blooming ends.

What strength of feed for nemesia strumosa 'poetry blue'?

What does over-feeding nemesia strumosa 'poetry blue' 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 nemesia strumosa 'poetry blue' 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 nemesia strumosa 'poetry blue'?