Soil & potting mix
Best soil for Garden Catmint (Nepeta × faassenii)
Also called Garden Catmint, Blue Catmint, Faassen's Catnip.
More about garden catmint
About Garden Catmint
Nepeta × faassenii · also called Garden Catmint, Blue Catmint · herb
Garden Catmint is a mounding, aromatic perennial prized for its lavender-blue flower spikes and silver-green foliage. A sterile hybrid, it blooms prolifically from late spring to autumn if cut back after the first flush. Drought-tolerant and deer-resistant, it thrives at border edges in full sun.
Preferred mix: Well-drained loam or sandy loam
Watch for — Flopping after first bloom: Cut plants back by half immediately after the first flowering flush (typically early summer) to encourage a compact second flush of bloom and tidy growth.
Why garden catmint needs this mix
Garden Catmint is a hungry, thirsty leafy herb — it wants a rich, moisture-retentive but free-draining loam, well fed and never baked dry.
- Garden Catmint grows fast and puts on a lot of soft leaf, so it draws heavily on both nutrients and water — a lean mix simply cannot keep up.
- Plenty of organic matter holds moisture evenly, which prevents the stress problems (bolting, bitterness, blossom-end rot) that come from a drying-then-flooding cycle.
- It still needs structure: rich does not mean airless, so grit, perlite or leaf mould keeps roots oxygenated.
For the full picture on what makes up a good mix, see our guide to the main types of soil and potting media — it explains why each ingredient above behaves the way it does.
What goes wrong with the wrong mix
The wrong soil is one of the most common reasons garden catmint struggles, and the damage often shows up weeks later as a watering problem. For this species specifically:
- A poor, thin or sandy mix starves garden catmint — growth stalls, leaves pale, and the plant bolts to seed early.
- A heavy, compacted, badly drained soil rots the roots and brings fungal problems despite all the feeding.
- Letting a rich mix dry to dust then drowning it causes the classic moisture-stress disorders this crop is prone to.
Under-feeding and inconsistent moisture. Garden Catmint needs genuinely rich soil plus steady watering — most disappointing crops come down to one or both being short.
pH — does it matter for garden catmint?
Garden Catmint does best around pH 6.0-7.0 (slightly acidic to neutral). It is worth a cheap soil test for an outdoor bed; very acidic soil benefits from a little lime well before planting.
If you want to check or adjust it, the soil pH guide walks through testing and the safe ways to nudge a mix more acidic or more alkaline.
DIY mix vs a bagged one
For containers a good multipurpose or vegetable compost works for garden catmint with extra feed through the season. For beds, the real win is digging in plenty of well-rotted compost or manure — that beats any bag.
Drainage and the pot
Rich but free-draining is the target: raised beds and large containers both deliver it. Mulch heavily to even out moisture and roughly halve how often you water.
Garden Catmint is usually grown for a single season, so "repotting" means starting fresh each year — never reuse exhausted, disease-prone compost for the same crop family. When the time comes, our repotting guide for garden catmint covers the timing and technique step by step.
Garden Catmint soil — frequently asked questions
What is the best soil mix for garden catmint?
3 parts rich peat-free compost : 1 part well-rotted garden compost or manure : 1 part perlite or grit (containers) / leaf mould (beds). Garden Catmint grows fast and puts on a lot of soft leaf, so it draws heavily on both nutrients and water — a lean mix simply cannot keep up.
Can I use normal potting soil for garden catmint?
A poor, thin or sandy mix starves garden catmint — growth stalls, leaves pale, and the plant bolts to seed early. For containers a good multipurpose or vegetable compost works for garden catmint with extra feed through the season. For beds, the real win is digging in plenty of well-rotted compost or manure — that beats any bag.
Does garden catmint need a special pH?
Garden Catmint does best around pH 6.0-7.0 (slightly acidic to neutral). It is worth a cheap soil test for an outdoor bed; very acidic soil benefits from a little lime well before planting.
Should I buy a bagged mix or make my own for garden catmint?
For containers a good multipurpose or vegetable compost works for garden catmint with extra feed through the season. For beds, the real win is digging in plenty of well-rotted compost or manure — that beats any bag.
How often should I refresh the soil for garden catmint?
Garden Catmint is usually grown for a single season, so "repotting" means starting fresh each year — never reuse exhausted, disease-prone compost for the same crop family. Rich but free-draining is the target: raised beds and large containers both deliver it. Mulch heavily to even out moisture and roughly halve how often you water.
Keep reading
- Garden Catmint care — the full brief (light, water, humidity, problems, pet safety)
- How often to water garden catmint — the schedule the mix feeds into
- Repotting garden catmint — when and how to refresh the mix
- Soil pH guide — test it and adjust it safely
- Should I water my plant? The simple check first
- Why is my plant wilting? Wet vs dry diagnosis
- Underwatered plant — signs and how to rehydrate it
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