Fertilising guide

How to fertilise Greek Mountain Tea (Sideritis syriaca)— schedule & NPK

Also called Greek mountain tea, ironwort, shepherd's tea.

More about greek mountain tea

About Greek Mountain Tea

Sideritis syriaca · also called Greek mountain tea, ironwort · herb

Greek mountain tea is a low, silvery, woolly-leaved Mediterranean subshrub in the mint family, topped in summer with spikes of pale yellow flowers. The whole flowering plant is dried for the traditional Balkan herbal tea. Adapted to hot, dry, rocky mountainsides, it demands sharp drainage and full sun and resents winter wet.

Growth habit: Low, mounding, woody-based evergreen subshrub with dense rosettes of felted grey-green leaves and erect summer spikes of tubular pale yellow flowers in whorled bracts.

Watch for — Loss of silvering in shade or rich soil: Foliage greens up and grows lax in low light or fertile ground; keep it sunny and lean to preserve the woolly grey character.

What fertiliser greek mountain tea actually wants — and why

Greek Mountain Tea is a soft, fast leafy herb that you harvest hard — a modest balanced feed keeps tender growth coming without tipping it into bland or bolting.

A balanced general feed (even N-P-K) at modest strength — enough nitrogen to keep replacing the leaves you pick, but not so much that flavour thins or it bolts to seed.

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 greek mountain tea: 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 greek mountain tea, 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 greek mountain tea:

None to minimal. Thrives on poor soil and rarely needs feeding; rich conditions produce soft growth that loses the silvery felt, flowers poorly, and rots more easily. Skip fertiliser in average free-draining ground. In practice: a balanced liquid feed every few weeks through the main growing and harvesting season (spring through early autumn), more often the harder you are picking it.

The dormant-season rule matters more than the exact interval: skip feeding entirely when greek mountain tea 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 greek mountain tea

Half strength is a sensible default for greek mountain tea — enough to fuel regrowth after cutting, gentle enough that the leaves stay aromatic rather than watery.

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

Signs you are over-feeding greek mountain tea

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

Fast, soft, pale growth with diluted, less aromatic flavour.
Early bolting (running to flower) and a bitter edge.
Salt crust and scorched tips on container plants.

Signs you are under-feeding greek mountain tea

Pale, slow regrowth after cutting and small leaves.
A tired, stalled plant that cannot keep up with harvesting.
Yellowing older leaves in a long-spent pot.

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

Flushing and leaching the salts

Pot-grown greek mountain tea builds up feed salts quickly — water until it drains each time and flush the pot with plain water every few weeks, especially on a sunny windowsill.

Organic vs synthetic feeds for greek mountain tea

Organic options

A diluted seaweed feed or worm-casting tea keeps soft growth coming without overdoing it. UK: dilute seaweed or Westland; US: Espoma Garden-tone or Neptune's Harvest. Gentle, hard to overdo, flavour-friendly.

Synthetic / liquid feeds

A balanced liquid feed at half strength through harvesting — UK: Phostrogen, Baby Bio or Westland; US: Miracle-Gro all-purpose at half strength. Fast regrowth; just do not overdo the nitrogen.

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 greek mountain tea — frequently asked questions

What fertiliser does greek mountain tea need?

A balanced general feed (even N-P-K) at modest strength — enough nitrogen to keep replacing the leaves you pick, but not so much that flavour thins or it bolts to seed. Greek Mountain Tea is a soft, fast leafy herb that you harvest hard — a modest balanced feed keeps tender growth coming without tipping it into bland or bolting.

How often should I feed greek mountain tea?

None to minimal. Thrives on poor soil and rarely needs feeding; rich conditions produce soft growth that loses the silvery felt, flowers poorly, and rots more easily. Skip fertiliser in average free-draining ground. None to minimal. Thrives on poor soil and rarely needs feeding; rich conditions produce soft growth that loses the silvery felt, flowers poorly, and rots more easily. Skip fertiliser in average free-draining ground. In practice: a balanced liquid feed every few weeks through the main growing and harvesting season (spring through early autumn), more often the harder you are picking it.

What strength of feed for greek mountain tea?