Repotting guide

When & how to repot Spanish snapdragon (Antirrhinum hispanicum)

Also called Spanish snapdragon, Spanish toadflax.

More about spanish snapdragon

About Spanish snapdragon

Antirrhinum hispanicum · also called Spanish snapdragon, Spanish toadflax · flowering

A tough, drought-tolerant perennial snapdragon native to rocky slopes of Spain and Morocco. Unlike common snapdragons it thrives through hot summers, producing pale pink-to-white snapdragon flowers with a yellow lip from late spring to autumn. Grow in full sun and very well-drained soil; established plants need minimal irrigation.

Mature size: 20–45 cm tall (8–18 in); 30–60 cm spread (12–24 in)

Watch for — Root rot from overwatering: The most common killer of this species. Ensure extremely free-draining soil and never let roots sit in moisture. Raised beds or gravel borders provide the best insurance.

How to tell spanish snapdragon needs repotting

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

Every 2–3 years, into bone-dry mix. Spanish snapdragon's growth habit — low, mounding, spreading sub-shrubby perennial — sets the pace. A tough, drought-tolerant perennial snapdragon native to rocky slopes of Spain and Morocco. Unlike common snapdragons it thrives through hot summers, producing pale pink-to-white snapdragon flowers with a yellow lip from late spring to autumn. Grow in full sun and very well-drained soil; established plants need minimal irrigation.

What size pot to step spanish snapdragon up to

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

Spring or summer, while spanish snapdragon 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 spanish snapdragon

Repot dry. Do not water spanish snapdragon 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 sandy, gritty, or rocky, very free-draining; ph 6.0–7.5 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 spanish snapdragon 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 spanish snapdragon 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 spanish snapdragon

Spanish snapdragon wants sandy, gritty, or rocky, very free-draining; ph 6.0–7.5. Native to poor, rocky, alkaline soils. Tolerates low fertility and even compacted soils better than most snapdragons. Does not require rich compost amendments; over-fertile soil produces lax growth. Perfect for gravel gardens and raised beds. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting spanish snapdragon — frequently asked questions

How often should you repot spanish snapdragon?

Every 2–3 years, into bone-dry mix for spanish snapdragon. Repot spanish snapdragon every 2–3 years into a snug pot of sandy, gritty, or rocky, very free-draining; ph 6.0–7.5, 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 spanish snapdragon need?

When is the best time of year to repot spanish snapdragon?

Should you water spanish snapdragon after repotting?

No — not straight away. Repot spanish snapdragon 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 spanish snapdragon after repotting?

Not immediately. Wait about 3 weeks after repotting spanish 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.