Fertilising guide
How to fertilise The Blues Little Bluestem (Schizachyrium scoparium 'The Blues')— schedule & NPK
Also called The Blues little bluestem, The Blues bluestem.
More about the blues little bluestem
About The Blues Little Bluestem
Schizachyrium scoparium 'The Blues' · also called The Blues little bluestem, The Blues bluestem · flowering
Schizachyrium scoparium 'The Blues' is a selected cultivar of little bluestem chosen for exceptional steely-blue summer foliage — the most intensely blue of any commonly available little bluestem. It turns vivid orange-red in autumn with showy white seed heads. Compact and upright, it performs best in lean soils and full sun, maintaining a tighter, more uniform clump than the straight species.
Growth habit: Compact, strongly upright, narrow bunchgrass clump; foliage strikingly blue-grey in summer, turning vivid orange-red in autumn; fluffy white seed heads in late summer to winter
Watch for — Loss of blue colour in rich soils: The defining steely-blue foliage colour is diminished or lost entirely when the plant is grown in fertile, amended, or moist soils. The cultivar's blue character is only fully expressed in lean, well-drained, infertile conditions. Soil amendment is the most common mistake made with this cultivar.
What fertiliser the blues little bluestem actually wants — and why
The Blues Little Bluestem is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula.
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 the blues little bluestem: 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 the blues little bluestem, 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 the blues little bluestem:
Do not fertilise. 'The Blues' is a cultivar selected precisely for its behaviour in lean soils; fertilising destroys the compact habit and the depth of blue colour that define it as a named selection. Grow in unamended, infertile soil. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
The dormant-season rule matters more than the exact interval: skip feeding entirely when the blues little bluestem 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 the blues little bluestem
Half strength is the safe default for the blues little bluestem — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
Feeding always goes onto already-damp soil, never dry roots — water the blues little bluestem first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the the blues little bluestem watering schedule.
Signs you are over-feeding the blues little bluestem
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for the blues little bluestem:
- Brown, crispy leaf tips and edges with no sign of underwatering.
- A white, crusty salt deposit on the soil surface or pot rim.
- Weak, pale, stretched new growth that flops.
- Lower leaves yellow and drop while the soil is correctly watered.
Signs you are under-feeding the blues little bluestem
- Uniformly pale or yellow-green leaves, oldest first.
- Noticeably small new leaves and stalled growth in good light and season.
- A generally tired, lacklustre look despite correct watering and light.
If the symptoms point at watering, light or roots rather than nutrition, the full the blues little bluestem care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of the blues little bluestem with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Organic vs synthetic feeds for the blues little bluestem
Organic options
A diluted seaweed or worm-casting feed, or fish emulsion if you can tolerate the smell indoors. UK: Westland or Baby Bio Organic, dilute seaweed; US: Espoma Indoor! or Neptune's Harvest fish & seaweed. Slow, gentle and hard to overdo.
Synthetic / liquid feeds
A general-purpose houseplant liquid at half strength — UK: Baby Bio, Westland Houseplant Feed or Phostrogen; US: Miracle-Gro Indoor Plant Food or Schultz. Convenient and fast-acting; the only risk is overdoing it.
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 the blues little bluestem — frequently asked questions
What fertiliser does the blues little bluestem need?
A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula. The Blues Little Bluestem is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.
How often should I feed the blues little bluestem?
Do not fertilise. 'The Blues' is a cultivar selected precisely for its behaviour in lean soils; fertilising destroys the compact habit and the depth of blue colour that define it as a named selection. Grow in unamended, infertile soil. Do not fertilise. 'The Blues' is a cultivar selected precisely for its behaviour in lean soils; fertilising destroys the compact habit and the depth of blue colour that define it as a named selection. Grow in unamended, infertile soil. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.
What strength of feed for the blues little bluestem?
Half strength is the safe default for the blues little bluestem — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding the blues little bluestem look like?
Brown, crispy leaf tips and edges with no sign of underwatering. A white, crusty salt deposit on the soil surface or pot rim. Weak, pale, stretched new growth that flops. Lower leaves yellow and drop while the soil is correctly watered. Feeding the blues little bluestem year-round on a fixed schedule, including dark winter months, is the most common mistake — it cannot use the nutrients in low light and the surplus simply burns the roots and crusts the soil.
Should I flush the soil of the blues little bluestem?
Flush the pot of the blues little bluestem with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.
Keep reading
- The Blues Little Bluestem care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water the blues little bluestem — 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 pond cypress
- How to fertilise cheshunt pine
- How to fertilise russian arborvitae
- All 6887 fertilising guides in the Growli library