Repotting guide

When & how to repot Potomac Early snapdragon (Antirrhinum majus 'Potomac Early')

Also called Potomac Early snapdragon, snapdragon.

More about potomac early snapdragon

About Potomac Early snapdragon

Antirrhinum majus 'Potomac Early' · also called Potomac Early snapdragon, snapdragon · flowering

Potomac Early is a tall, heat-tolerant cut-flower snapdragon bred for early bloom and long stems. Direct-sow or transplant into full sun after last frost. Deadhead spent spikes to prolong flowering. Excellent for cottage gardens and borders; thrives in cool-to-mild weather and fades in midsummer heat.

Mature size: 90–120 cm tall (36–48 in), spread 23–30 cm (9–12 in)

How to tell potomac early snapdragon needs repotting

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

Roots circling the bottom of the module or pot, or poking out of the drainage holes.
The seedling dries out within a day and growth has visibly stalled.
Roots are white and matted in a tight spiral when you tip the plant out.
It has outgrown its current container for the stage of the season — pot potomac early snapdragon on before it becomes hard root-bound.

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 potomac early snapdragon

Pot on seedlings as they grow; not a perennial repot. Potomac Early snapdragonis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Upright, tall-stemmed annual forming basal rosettes before bolting to spikes reaching 90–120 cm (36–48 in). Bred specifically for long, straight cut-flower stems..

What size pot to step potomac early snapdragon up to

Pot potomac early snapdragon 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 potomac early snapdragon

Pot potomac early snapdragon 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 potomac early snapdragon

Pot on before it is root-bound. Check potomac early snapdragon regularly; move it up as soon as roots reach the edge of the cell or pot, not after they have circled.
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.
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.
Pot into rich mix. Set it into fresh fertile, well-drained loam at the same depth (tomatoes are the exception — they can go deeper to root along the stem).
Water in and grow on. Water well, keep it in good light, and resume feeding once it is established and growing again.

Aftercare

Water potomac early snapdragon 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 potomac early snapdragon

Potomac Early snapdragon wants fertile, well-drained loam. Prefers fertile, moderately moist, well-drained soil with a pH of 6.0–7.0. Amend heavy clay with compost and grit. Poor drainage leads to root rot and basal stem diseases. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting potomac early snapdragon — frequently asked questions

How often should you repot potomac early snapdragon?

Pot on seedlings as they grow; not a perennial repot for potomac early snapdragon. Potomac Early snapdragon is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into fertile, well-drained loam 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 potomac early snapdragon need?

When is the best time of year to repot potomac early snapdragon?

Can you put potomac early snapdragon straight into a much bigger pot?

No. Even a fast-growing potomac early snapdragon 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 potomac early snapdragon after repotting?

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