Soil & potting mix
Best soil for Ribbon Grass (Phalaris arundinacea 'Picta')
Also called ribbon grass, gardeners garters, variegated reed canary grass.
More about ribbon grass
About Ribbon Grass
Phalaris arundinacea 'Picta' · also called ribbon grass, gardeners garters · flowering
Ribbon grass, or gardener's garters, is a cool-season variegated grass with bright white-and-green striped blades, sometimes flushed pink in cool weather. Extremely vigorous and rhizomatous, it spreads aggressively and is considered invasive in many regions, so containment is essential. Tough and adaptable, it tolerates sun or shade, wet or dry soil, making it a resilient but assertive groundcover.
Preferred mix: Adaptable, moisture-retentive soil
Watch for — Invasive spreading: Runs rampantly by rhizomes and is invasive in many areas, escaping into wetlands; plant only in containers or with strong root barriers.
Why ribbon grass needs this mix
Ribbon Grass hates drying out, so it wants a mix that stays evenly moist — but it still needs perlite so "moist" never tips into "waterlogged".
- Ribbon Grass comes from damp, shaded forest floors and has fine roots that scorch and brown the moment the rootball dries — the mix has to hold a steady reserve.
- Coir and compost give that reserve, while perlite keeps enough air that the constantly-moist mix does not turn anaerobic.
- Even moisture also keeps its thin leaves from crisping at the edges, which is this plant’s most visible stress signal.
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 ribbon grass struggles, and the damage often shows up weeks later as a watering problem. For this species specifically:
- A free-draining, gritty mix dries too fast for ribbon grass — you get crispy brown edges and frond or leaf drop within days of one missed watering.
- A pure, airless peat mix swings the other way: it holds water but suffocates the fine roots and rots the crown.
- Letting the mix dry to the point it shrinks from the pot is very hard to re-wet evenly and stresses the plant badly.
Using a sharp, fast-draining "houseplant" or cactus-leaning mix that lets ribbon grass dry out. It needs a moisture-retentive but still airy blend.
pH — does it matter for ribbon grass?
Ribbon Grass prefers a slightly acidic mix (around pH 5.5-6.5); a peat-free compost-and-coir blend sits there naturally, so routine pH testing is unnecessary.
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
A good peat-free houseplant compost works for ribbon grass straight from the bag if you mix in some perlite for air. The DIY ratio above gives a more reliable moisture-to-air balance.
Drainage and the pot
Use a pot with a drainage hole but a less-porous material (plastic or glazed) so it does not dry too fast. Bottom-watering keeps the mix evenly moist without sogging the crown.
Peat-free mixes slump and compact as they hold moisture, so refresh ribbon grass's mix every 12-18 months to keep air in the rootball even if the pot size is unchanged. When the time comes, our repotting guide for ribbon grass covers the timing and technique step by step.
Ribbon Grass soil — frequently asked questions
What is the best soil mix for ribbon grass?
3 parts peat-free houseplant compost : 1 part coco coir : 1 part perlite. Ribbon Grass comes from damp, shaded forest floors and has fine roots that scorch and brown the moment the rootball dries — the mix has to hold a steady reserve.
Can I use normal potting soil for ribbon grass?
A free-draining, gritty mix dries too fast for ribbon grass — you get crispy brown edges and frond or leaf drop within days of one missed watering. A good peat-free houseplant compost works for ribbon grass straight from the bag if you mix in some perlite for air. The DIY ratio above gives a more reliable moisture-to-air balance.
Does ribbon grass need a special pH?
Ribbon Grass prefers a slightly acidic mix (around pH 5.5-6.5); a peat-free compost-and-coir blend sits there naturally, so routine pH testing is unnecessary.
Should I buy a bagged mix or make my own for ribbon grass?
A good peat-free houseplant compost works for ribbon grass straight from the bag if you mix in some perlite for air. The DIY ratio above gives a more reliable moisture-to-air balance.
How often should I refresh the soil for ribbon grass?
Peat-free mixes slump and compact as they hold moisture, so refresh ribbon grass's mix every 12-18 months to keep air in the rootball even if the pot size is unchanged. Use a pot with a drainage hole but a less-porous material (plastic or glazed) so it does not dry too fast. Bottom-watering keeps the mix evenly moist without sogging the crown.
Keep reading
- Ribbon Grass care — the full brief (light, water, humidity, problems, pet safety)
- How often to water ribbon grass — the schedule the mix feeds into
- Repotting ribbon grass — when and how to refresh the mix
- Soil pH guide — test it and adjust it safely
- Underwatered plant — signs and how to rehydrate it
- Why is my plant wilting? Wet vs dry diagnosis
- Should I water my plant? The simple check first
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