Fertilising guide

How to fertilise Creeping Mazus (Mazus reptans)— schedule & NPK

Also called Creeping Mazus, Chinese Marshflower.

More about creeping mazus

About Creeping Mazus

Mazus reptans · also called Creeping Mazus, Chinese Marshflower · flowering

A fast-spreading, low-growing perennial producing masses of small, snapdragon-like lavender-blue flowers with white and yellow markings from late spring to early summer. Grows only 2–5 cm tall, tolerates light foot traffic, and fills gaps between stepping stones effectively. Prefers moist conditions and can be used in rain gardens. Not individually listed by ASPCA.

Growth habit: Prostrate, mat-forming herbaceous perennial. Stems spread laterally and root at nodes. Semi-evergreen in mild climates; dies back to the crown in colder winters. Tolerates light foot traffic and intermittent mowing.

What fertiliser creeping mazus actually wants — and why

Creeping Mazus flowers best on poor soil — feed it and you get a lush leafy plant with very few blooms, the exact opposite of what you want.

Little or nothing. Rich, especially nitrogen-rich, soil pushes foliage at the expense of flowers in this plant — lean ground is the technique, not a deficiency.

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 creeping mazus: 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 creeping mazus, 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 creeping mazus:

Apply a balanced, water-soluble fertiliser at half strength once in early spring and once in early summer. Avoid overfeeding, which can promote lush foliage at the expense of flowers and increase susceptibility to fungal issues. In practice: no routine feeding at all for creeping mazus — at most a thin compost mulch for soil structure, never a flowering or nitrogen feed.

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

None is the correct answer for creeping mazus. The flower-versus-foliage trade-off is the whole point: hold back and you get the display.

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

Signs you are over-feeding creeping mazus

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

Abundant leafy growth and very few flowers (the classic over-rich symptom).
Soft, floppy stems and a sprawling, leafy habit.
Scorched edges and salt crust if it has been fed in a container.

Signs you are under-feeding creeping mazus

Effectively never an issue — these plants flower on poverty.
Only on genuinely dead soil: weak, thin growth and few blooms.
A short-lived plant in completely spent container compost.

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

Flushing and leaching the salts

If creeping mazus has accidentally been fed and is all leaf, a plain-water flush plus a move to leaner soil resets it; otherwise no flushing is needed because you are not feeding it.

Organic vs synthetic feeds for creeping mazus

Organic options

A thin compost mulch for soil structure is the absolute most; mostly, give it nothing. UK/US: leave it lean — no manure, no liquid feed. Poor soil is the active ingredient here.

Synthetic / liquid feeds

None. Synthetic feeds, particularly anything with appreciable nitrogen, directly suppress flowering in creeping mazus.

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 creeping mazus — frequently asked questions

What fertiliser does creeping mazus need?

Little or nothing. Rich, especially nitrogen-rich, soil pushes foliage at the expense of flowers in this plant — lean ground is the technique, not a deficiency. Creeping Mazus flowers best on poor soil — feed it and you get a lush leafy plant with very few blooms, the exact opposite of what you want.

How often should I feed creeping mazus?

Apply a balanced, water-soluble fertiliser at half strength once in early spring and once in early summer. Avoid overfeeding, which can promote lush foliage at the expense of flowers and increase susceptibility to fungal issues. Apply a balanced, water-soluble fertiliser at half strength once in early spring and once in early summer. Avoid overfeeding, which can promote lush foliage at the expense of flowers and increase susceptibility to fungal issues. In practice: no routine feeding at all for creeping mazus — at most a thin compost mulch for soil structure, never a flowering or nitrogen feed.

What strength of feed for creeping mazus?