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Fertilising guide

How to fertilise Nepeta 'Six Hills Giant' (Nepeta 'Six Hills Giant')— schedule & NPK

Also called Six Hills Giant catmint, tall catmint.

More about nepeta 'six hills giant'

About Nepeta 'Six Hills Giant'

Nepeta 'Six Hills Giant' · also called Six Hills Giant catmint, tall catmint · flowering

Nepeta 'Six Hills Giant' is a large, vigorous catmint forming billowing mounds of grey-green aromatic foliage smothered in long spikes of lavender-blue flowers from early summer. Exceptionally bee-friendly, drought-tolerant and easy, it is a classic for softening path edges and rose borders. A hard cut-back after the first flush triggers a strong second bloom into autumn.

Growth habit: Large, mound-forming clump of sprawling aromatic stems; non-running and clump-forming, reaching substantial width.

What fertiliser nepeta 'six hills giant' actually wants — and why

Nepeta 'Six Hills Giant' 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 nepeta 'six hills giant': 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 nepeta 'six hills giant', 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 nepeta 'six hills giant':

Needs very little. Skip feeding in average soil; a thin spring mulch is enough on poor ground. Feeding rich soils produces weak, flopping stems and fewer flowers. 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 nepeta 'six hills giant' 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 nepeta 'six hills giant'

Half strength is the safe default for nepeta 'six hills giant' — 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 nepeta 'six hills giant' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the nepeta 'six hills giant' watering schedule.

Signs you are over-feeding nepeta 'six hills giant'

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for nepeta 'six hills giant':

Signs you are under-feeding nepeta 'six hills giant'

If the symptoms point at watering, light or roots rather than nutrition, the full nepeta 'six hills giant' care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

Flush the pot of nepeta 'six hills giant' 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 nepeta 'six hills giant'

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 nepeta 'six hills giant' — frequently asked questions

What fertiliser does nepeta 'six hills giant' 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. Nepeta 'Six Hills Giant' 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 nepeta 'six hills giant'?

Needs very little. Skip feeding in average soil; a thin spring mulch is enough on poor ground. Feeding rich soils produces weak, flopping stems and fewer flowers. Needs very little. Skip feeding in average soil; a thin spring mulch is enough on poor ground. Feeding rich soils produces weak, flopping stems and fewer flowers. 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 nepeta 'six hills giant'?

Half strength is the safe default for nepeta 'six hills giant' — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.

What does over-feeding nepeta 'six hills giant' 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 nepeta 'six hills giant' 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 nepeta 'six hills giant'?

Flush the pot of nepeta 'six hills giant' 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.

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