Fertilising guide
How to fertilise Marseille Germander (Teucrium massiliense)— schedule & NPK
Also called Marseille Germander, Hybrid Germander.
More about marseille germander
About Marseille Germander
Teucrium massiliense · also called Marseille Germander, Hybrid Germander · flowering
Teucrium massiliense is a deciduous Mediterranean subshrub native to southern France and surrounding coastal regions, growing to around 1 m tall with grey-tomentose stems and small pink flowers that appear in summer and sometimes again in early autumn. It demands full sun and alkaline, sharply drained soil, rewarding neglect with drought tolerance rather than regular irrigation. After two to three years of establishment virtually no supplemental watering is needed. The plant is mildly toxic if ingested due to diterpene compounds present throughout the Teucrium genus.
Growth habit: Upright to bushy deciduous subshrub with grey-tomentose stems.
What fertiliser marseille germander actually wants — and why
Marseille Germander 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 marseille germander: 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 marseille germander, 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 marseille germander:
Apply a low-nutrient, balanced feed once in spring; Mediterranean sub-shrubs perform best in lean soils and over-feeding reduces drought tolerance. 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 marseille germander 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 marseille germander
Half strength is the safe default for marseille germander — 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 marseille germander first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the marseille germander watering schedule.
Signs you are over-feeding marseille germander
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for marseille germander:
- 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 marseille germander
- 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 marseille germander care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of marseille germander 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 marseille germander
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 marseille germander — frequently asked questions
What fertiliser does marseille germander 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. Marseille Germander 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 marseille germander?
Apply a low-nutrient, balanced feed once in spring; Mediterranean sub-shrubs perform best in lean soils and over-feeding reduces drought tolerance. Apply a low-nutrient, balanced feed once in spring; Mediterranean sub-shrubs perform best in lean soils and over-feeding reduces drought tolerance. 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 marseille germander?
Half strength is the safe default for marseille germander — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding marseille germander 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 marseille germander 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 marseille germander?
Flush the pot of marseille germander 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
- Marseille Germander care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water marseille germander — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
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