Repotting guide

When & how to repot Bacopa monnieri (Bacopa monnieri)

Also called brahmi, water hyssop.

More about bacopa monnieri

About Bacopa monnieri

Bacopa monnieri · also called brahmi, water hyssop · tropical

Bacopa monnieri, the brahmi of Ayurvedic tradition, is a hardy creeping marsh herb grown both as a submersed aquarium plant and an emersed bog or pond-edge groundcover. It has small succulent leaves and tiny white flowers, tolerates a wide range of conditions, needs no CO2, and roots aggressively along every node.

Mature size: Stems trail 20-60 cm, forming spreading mats only a few centimetres tall emersed; submersed tips grow more upright to 15-30 cm.

Watch for — Slow start after planting: Newly planted or converted stems pause before rooting. Keep conditions stable; vigorous nodal rooting follows within a couple of weeks.

How to tell bacopa monnieri needs repotting

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

Roots growing out of the drainage holes, or the rootball lifting the plant proud of the rim.
Soil that has shrunk away from the pot sides and no longer holds water.
The pot is unstable because the plant has grown top-heavy.
Old, compacted, broken-down mix that stays wet too long — for a succulent that is a rot risk, so refresh it even if the pot size is fine.

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 bacopa monnieri

Every 2–3 years, into bone-dry mix. Bacopa monnieri's growth habit — low, creeping, mat-forming perennial herb with prostrate stems that root at every node; sends up short erect tips and trails over edges. — sets the pace. Bacopa monnieri, the brahmi of Ayurvedic tradition, is a hardy creeping marsh herb grown both as a submersed aquarium plant and an emersed bog or pond-edge groundcover. It has small succulent leaves and tiny white flowers, tolerates a wide range of conditions, needs no CO2, and roots aggressively along every node.

What size pot to step bacopa monnieri up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Bacopa monnieri stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes.

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 bacopa monnieri

Spring or summer, while bacopa monnieri is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Step-by-step: repotting bacopa monnieri

Repot dry. Do not water bacopa monnieri for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty wet, nutrient-rich loam or aquatic substrate ready.
Tip it out and clean the roots. Slide the plant out, crumble off the old soil, and trim any black, mushy or dead roots with clean snips.
Pot into dry mix. Set bacopa monnieri at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
Wait a week before watering. Leave it completely dry and out of harsh sun for about 7 days so any damaged roots callus. Only then water lightly.

Aftercare

Keep bacopa monnieri completely dry and out of fierce sun for about a week so any nicked roots callus before they meet moisture; watering a freshly repotted succulent is the classic way to rot it. Then resume the normal lean, dry rhythm. Do not fertilise for about 3 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for bacopa monnieri

Bacopa monnieri wants wet, nutrient-rich loam or aquatic substrate. Roots in aquasoil, sand or muddy loam; an undemanding feeder. Emersed, grow in constantly wet, fertile soil at a pond margin or in a bog garden. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting bacopa monnieri — frequently asked questions

How often should you repot bacopa monnieri?

Every 2–3 years, into bone-dry mix for bacopa monnieri. Repot bacopa monnieri every 2–3 years into a snug pot of wet, nutrient-rich loam or aquatic substrate, ideally in spring or summer. Let it sit in dry soil and do not water for about a week afterwards so any nicked roots can callus. Over-potting and watering straight away is what rots succulents.

What size pot does bacopa monnieri need?

When is the best time of year to repot bacopa monnieri?

Should you water bacopa monnieri after repotting?

No — not straight away. Repot bacopa monnieri into dry mix and wait about a week before the first watering so any damaged roots callus over. Watering a freshly repotted succulent is the single most common way to rot one.

Should you fertilise bacopa monnieri after repotting?

Not immediately. Wait about 3 weeks after repotting bacopa monnieri. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.