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Repotting guide

When & how to repot Mignonette (Reseda odorata)

Also called Mignonette, Garden mignonette, Sweet mignonette.

More about mignonette

About Mignonette

Reseda odorata · also called Mignonette, Garden mignonette · flowering

Mignonette is a cool-season annual beloved since the 18th century for its intensely sweet, honey-like fragrance rather than its modest, small yellowish-green flowers. Native to North Africa, it thrives in cool summers and poor to moderately fertile, well-drained, slightly alkaline soil. Best direct-sown; does not transplant well. Excellent for cutting gardens.

Mature size: 30–45 cm tall, 20–30 cm spread

Watch for — Poor transplant survival: Mignonette has a taproot and strongly resents root disturbance. Direct sow in final position after last frost. If starting indoors, use deep biodegradable pots and transplant at the 2-leaf stage without disturbing the root.

How to tell mignonette needs repotting

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

Pot on seedlings as they grow; not a perennial repot. Mignonetteis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Upright to sprawling, bushy cool-season annual; produces racemes of small, fragrant flowers on branching stems.

What size pot to step mignonette up to

Pot mignonette 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 mignonette

Pot mignonette 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 mignonette

  1. Pot on before it is root-bound. Check mignonette 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 humus-rich, well-drained loam or sandy loam; ph 6.5–7.8 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 mignonette 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 mignonette

Mignonette wants humus-rich, well-drained loam or sandy loam; ph 6.5–7.8. Thrives in neutral to mildly alkaline soil with good organic matter content. Avoid highly acidic or waterlogged soils. Incorporates well-rotted compost before sowing; poor soils reduce plant vigour but excessive fertility promotes leaf growth over flowers. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting mignonette — frequently asked questions

How often should you repot mignonette?

Pot on seedlings as they grow; not a perennial repot for mignonette. Mignonette is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into humus-rich, well-drained loam or sandy loam; ph 6.5–7.8 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 mignonette need?

Pot mignonette 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 mignonette?

Pot mignonette 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 mignonette straight into a much bigger pot?

No. Even a fast-growing mignonette 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 mignonette after repotting?

Not immediately. Wait about 1 week after repotting mignonette. 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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