Repotting guide

When & how to repot Bacopa caroliniana (Bacopa caroliniana)

Also called giant Bacopa, blue waterhyssop.

More about bacopa caroliniana

About Bacopa caroliniana

Bacopa caroliniana · also called giant Bacopa, blue waterhyssop · tropical

Bacopa caroliniana is an undemanding, slow-but-steady aquarium stem plant from the southern USA with thick, rounded leaves that smell of lemon when crushed and flush copper-bronze under bright light. It tolerates a wide range of conditions, needs no CO2, and is a classic beginner background plant for tanks and paludariums.

Mature size: Submersed stems reach 20-50 cm tall; emersed it grows more compact with thicker leaves and can produce small blue flowers.

How to tell bacopa caroliniana needs repotting

Repotting on a calendar is less reliable than reading the plant. For bacopa caroliniana, 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 caroliniana

Every 2–3 years, into bone-dry mix. Bacopa caroliniana's growth habit — upright, slow-to-moderate stem plant with paired succulent leaves; branches from the base and roots at nodes to form a sturdy column. — sets the pace. Bacopa caroliniana is an undemanding, slow-but-steady aquarium stem plant from the southern USA with thick, rounded leaves that smell of lemon when crushed and flush copper-bronze under bright light. It tolerates a wide range of conditions, needs no CO2, and is a classic beginner background plant for tanks and paludariums.

What size pot to step bacopa caroliniana up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Bacopa caroliniana 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 caroliniana

Spring or summer, while bacopa caroliniana 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 caroliniana

Repot dry. Do not water bacopa caroliniana 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 nutrient-rich to standard 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 caroliniana 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 caroliniana 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 caroliniana

Bacopa caroliniana wants nutrient-rich to standard aquatic substrate. Roots in aquasoil, sand or gravel; root tabs help but it also feeds well from the water column. Emersed, use wet, fertile loam in a bog or pond margin. 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 caroliniana — frequently asked questions

How often should you repot bacopa caroliniana?

Every 2–3 years, into bone-dry mix for bacopa caroliniana. Repot bacopa caroliniana every 2–3 years into a snug pot of nutrient-rich to standard 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 caroliniana need?

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

Should you water bacopa caroliniana after repotting?

No — not straight away. Repot bacopa caroliniana 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 caroliniana after repotting?

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