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Repotting guide

When & how to repot Epazote (Dysphania ambrosioides)

Also called Mexican Tea, Wormseed.

More about epazote

About Epazote

Dysphania ambrosioides · also called Mexican Tea, Wormseed · herb

Epazote is a pungent, resinous annual or short-lived perennial herb essential to Mexican cooking, especially with beans, where it adds flavour and is said to reduce gassiness. A tough, sun-loving plant of warm climates, it tolerates poor dry soil and grows tall and weedy. Its potent essential oil makes it medicinal and toxic in concentrated form.

Mature size: Commonly 0.6-1.2 m tall, occasionally to 1.5 m, and 30-60 cm wide.

Watch for — Frost kill: It is frost-tender and dies back with the first hard freeze in cool climates. Treat as an annual or grow in pots that can be moved under cover.

How to tell epazote needs repotting

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

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 epazote

Pot on seedlings as they grow; not a perennial repot. Epazoteis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Erect, branching annual or short-lived perennial with a strong central stem and toothed, lance-shaped leaves. Vigorous and weedy, it self-seeds prolifically and can naturalise aggressively if flower spikes are not removed..

What size pot to step epazote up to

Pot epazote on gradually — a seedling jumped straight into a huge pot sits in cold, wet, airless soil and stalls. Step up one or two sizes at a time as the roots fill each container, finishing in a large final pot or the ground. The aim is roots that never circle and never check.

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 epazote

Pot epazote on through the active growing season, whenever roots fill the current container — there is no single date, just "before it becomes root-bound". Avoid potting on during a cold snap.

Step-by-step: repotting epazote

  1. Pot on before it is root-bound. Check epazote regularly; move it up as soon as roots reach the edge of the cell or pot, not after they have circled.
  2. Step up one or two sizes. Choose the next container up — not a giant one. Cold, wet, unused soil around a small root system stalls seedlings.
  3. Knock it out gently. Support the stem, tip the pot, and ease the rootball out without breaking it. A little teasing of circled roots at the base is fine.
  4. Pot into rich mix. Set it into fresh average, well-drained soil at the same depth (tomatoes are the exception — they can go deeper to root along the stem).
  5. Water in and grow on. Water well, keep it in good light, and resume feeding once it is established and growing again.

Aftercare

Water epazote in well and keep it in bright light; a freshly potted-on seedling can wilt for a day while roots settle, so do not overcompensate by drowning it. Do not fertilise for about 1 week — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for epazote

Epazote wants average, well-drained soil. Adaptable and unfussy, thriving even in poor, sandy, or stony ground with good drainage, at a wide pH around 5.5-8.0. Rich soil produces lusher growth but a milder, less concentrated flavour. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting epazote — frequently asked questions

How often should you repot epazote?

Pot on seedlings as they grow; not a perennial repot for epazote. Epazote is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into average, well-drained soil so the roots never circle the cell, ending in a large final container. A root-bound transplant stalls and never fully recovers.

What size pot does epazote need?

Pot epazote on gradually — a seedling jumped straight into a huge pot sits in cold, wet, airless soil and stalls. Step up one or two sizes at a time as the roots fill each container, finishing in a large final pot or the ground. The aim is roots that never circle and never check. Use our pot size calculator to size it from the plant's current pot and root spread.

When is the best time of year to repot epazote?

Pot epazote on through the active growing season, whenever roots fill the current container — there is no single date, just "before it becomes root-bound". Avoid potting on during a cold snap.

Can you put epazote straight into a much bigger pot?

No. Even a fast-growing epazote should only go up one pot size at a time. A vastly oversized pot holds a reservoir of wet soil the roots cannot reach, which stays cold and soggy and rots the roots — the opposite of what you wanted.

Should you fertilise epazote after repotting?

Not immediately. Wait about 1 week after repotting epazote. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.

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