Repotting guide

When & how to repot Artillery Plant (Pilea microphylla)

Also called Artillery Plant, Artillery Fern, Rockweed, Gunpowder Plant, Angeloweed.

More about artillery plant

About Artillery Plant

Pilea microphylla · also called Artillery Plant, Artillery Fern · houseplant

The artillery plant (Pilea microphylla) is a fine-textured, fern-like trailing houseplant in the nettle family, named for the way it puffs out pollen. It wants bright indirect light, consistently moist soil, and humidity above 50 percent. ASPCA lists it as non-toxic to cats, dogs, and horses, making it a genuinely pet-safe choice.

Mature size: Indoors typically 15-30 cm (6-12 in) tall with a spread of up to 60 cm (2 ft). Hardy outdoors only in USDA zones 11a-12b; elsewhere it is grown as a houseplant or warm-season annual.

Watch for — Root rot from overwatering: Soggy, poorly drained soil is the most common killer. Stems blacken and collapse at the base. Use a well-draining mix, a pot with drainage holes, and let the top of the soil dry slightly between waterings.

How to tell artillery plant needs repotting

Repotting on a calendar is less reliable than reading the plant. For artillery plant, watch for these signs:

Roots creeping out of the drainage holes or matting tightly across the soil surface.
The rootball dries out within a day or two no matter how much you water.
Water channels straight down the gap between rootball and pot without wetting the centre.
Steady decline — thin growth, persistent crispy edges — that good humidity and watering have not fixed. Only then is the disturbance of a repot worth the risk for artillery plant.

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot artillery plant

Every 1–2 years, disturbing the roots as little as possible. Artillery Plant's growth habit — fast-growing, dense, mat-forming creeper with a fine, fern-like texture and succulent, easily snapped stems. trails or mounds, making it well suited to hanging baskets, terrariums, and groundcover-style pots. pinch regularly to keep it compact and bushy; it tends to grow leggy and woody at the base with age. — sets the pace. The artillery plant (Pilea microphylla) is a fine-textured, fern-like trailing houseplant in the nettle family, named for the way it puffs out pollen. It wants bright indirect light, consistently moist soil, and humidity above 50 percent. ASPCA lists it as non-toxic to cats, dogs, and horses, making it a genuinely pet-safe choice.

What size pot to step artillery plant up to

Go up only one size and handle the rootball as little as possible. Artillery Plant resents root disturbance, so the goal is to slide the intact rootball into slightly more soil — not to tease, wash or prune the roots. A modest step up means less shock and a faster recovery.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot artillery plant

Early spring, just as new growth restarts, is the ideal window for artillery plant. The plant is moving into its strongest growth phase and re-roots into fresh soil quickly. Avoid repotting in winter dormancy or, for flowering plants, while it is in bud or bloom — recovery is slowest then and you risk dropping the flowers.

Step-by-step: repotting artillery plant

Keep disturbance to a minimum. Artillery Plant resents root disturbance, so the plan is to move the intact rootball — not to wash, tease or prune the roots.
Choose just one size up. Pick a pot only one size larger with drainage, and have moisture-retentive light, well-draining, organic-rich potting mix ready.
Slide the rootball out whole. Water the day before, then ease artillery plant out keeping the rootball intact. Gently free only the roots that are circling the very bottom.
Nestle it into fresh soil. Add a base layer of fresh mix, set the rootball in at the same depth, and backfill gently around the sides without packing hard.
Water and protect. Water in, then keep it warm, humid and out of direct sun for a few weeks while it re-roots. Expect a short sulk — that is normal.

Aftercare

Expect artillery plant to sulk for a couple of weeks — that is normal after any root disturbance for this group. Keep it warm, humid and out of direct sun, water just enough to keep the mix lightly moist, and do not panic and overwater while it re-roots. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for artillery plant

Artillery Plant wants light, well-draining, organic-rich potting mix. Use a peat- or coir-based mix amended with perlite for drainage; an African violet mix works well by balancing moisture retention with aeration. It tolerates acidic, neutral, or alkaline pH. A breathable pot with drainage holes is essential to prevent root rot. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting artillery plant — frequently asked questions

How often should you repot artillery plant?

Every 1–2 years, disturbing the roots as little as possible for artillery plant. Repot artillery plant every 1–2 years, disturbing the roots as little as possible — it sulks for weeks if the rootball is teased apart. Slide it into one size up in spring with fresh light, well-draining, organic-rich potting mix, keep it warm and humid afterwards, and never bare-root or hard-prune the roots.

What size pot does artillery plant need?

When is the best time of year to repot artillery plant?

Why does artillery plant sulk after repotting?

Artillery Plant resents root disturbance, so a wilt or stall for a week or two after repotting is normal, not a failure. Minimise it by keeping the rootball intact, stepping up just one size, and keeping the plant warm, humid and out of direct sun while it re-roots.

Should you fertilise artillery plant after repotting?

Not immediately. Wait about 4 weeks after repotting artillery plant. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.