Fertilising guide

How to fertilise orange sinningia (Sinningia aggregata)— schedule & NPK

Also called orange sinningia, miniature gloxinia.

More about orange sinningia

About orange sinningia

Sinningia aggregata · also called orange sinningia, miniature gloxinia · flowering

A compact Brazilian tuberous gesneriad producing clusters of vivid orange-red tubular flowers freely over summer above sticky, lemony-scented foliage. Naturally goes dormant in winter, retreating to its underground tuber before re-sprouting in spring. Ideal for bright windowsills and conservatories; Sinningia speciosa (genus type) is listed as non-toxic by ASPCA.

Growth habit: Compact tuberous perennial with upright to somewhat sprawling stems; dies back to a tuber in winter dormancy

What fertiliser orange sinningia actually wants — and why

orange sinningia is a hungry evergreen fruiter with specific needs — a dedicated citrus feed, switched between summer and winter formulas, keeps it cropping and green.

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 orange sinningia: 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 orange sinningia, 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 orange sinningia:

The dormant-season rule matters more than the exact interval: skip feeding entirely when orange sinningia 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 orange sinningia

Follow the citrus-feed label rate for orange sinningia and use the correct seasonal formula. The trace-element content matters as much as the NPK — substituting a general feed is the usual cause of yellowing.

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

Signs you are over-feeding orange sinningia

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for orange sinningia:

Salt crust on the soil and scorched, browning leaf tips.
Excess soft leafy growth with poor fruit set from too much nitrogen.
Leaf drop shortly after an over-strong feed.

Signs you are under-feeding orange sinningia

Yellowing leaves — overall pale, or yellow between green veins (magnesium/iron).
Poor flowering and fruit set, small or dropping fruit.
Weak new growth and a generally tired tree.

If the symptoms point at watering, light or roots rather than nutrition, the full orange sinningia care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

Potted orange sinningia accumulates salts and benefits from a thorough plain-water flush every couple of months until it drains freely, plus an annual repot or top-dressing of fresh citrus compost.

Organic vs synthetic feeds for orange sinningia

Organic options

Well-rotted manure or compost mulch plus seaweed and an Epsom-salts (magnesium) drench supports orange sinningia naturally. UK: organic citrus feed or seaweed + Epsom salts; US: Espoma Citrus-tone or Dr. Earth Citrus.

Synthetic / liquid feeds

A proprietary summer and winter citrus feed — UK: Westland or Vitax Citrus (summer/winter); US: Miracle-Gro or Espoma Citrus. Using the right seasonal formula is the key to keeping orange sinningia green and cropping.

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 orange sinningia — frequently asked questions

What fertiliser does orange sinningia need?

A specialist citrus fertiliser, which carries the higher nitrogen plus the magnesium, iron and trace elements citrus need — generic feeds quickly leave it yellow and chlorotic. Many ranges have a summer (higher-N) and a winter (lower-N) formula. orange sinningia is a hungry evergreen fruiter with specific needs — a dedicated citrus feed, switched between summer and winter formulas, keeps it cropping and green.

How often should I feed orange sinningia?

Feed monthly during the growing season (late spring through early autumn) with a balanced water-soluble fertiliser (20-20-20 or equivalent) at half strength. Switch to a high-potassium feed as flower buds form to support blooming. Do not feed during dormancy. Feed monthly during the growing season (late spring through early autumn) with a balanced water-soluble fertiliser (20-20-20 or equivalent) at half strength. Switch to a high-potassium feed as flower buds form to support blooming. Do not feed during dormancy. In practice: a summer citrus feed regularly (often roughly fortnightly) from spring to autumn, switching to a winter citrus feed at a reduced rate over the colder months — citrus feed year-round, unlike most container plants.

What strength of feed for orange sinningia?

What does over-feeding orange sinningia look like?

Salt crust on the soil and scorched, browning leaf tips. Excess soft leafy growth with poor fruit set from too much nitrogen. Leaf drop shortly after an over-strong feed. Feeding orange sinningia an ordinary plant food instead of a citrus-specific one is the defining mistake — it lacks the magnesium and iron citrus demand, and the leaves yellow between the veins no matter how often you feed.

Should I flush the soil of orange sinningia?