Repotting guide

When & how to repot Torenia fournieri 'Catalina Midnight Blue' (Torenia fournieri 'Catalina Midnight Blue')

Also called Catalina Midnight Blue Wishbone Flower, Dark Blue Torenia.

More about torenia fournieri 'catalina midnight blue'

About Torenia fournieri 'Catalina Midnight Blue'

Torenia fournieri 'Catalina Midnight Blue' · also called Catalina Midnight Blue Wishbone Flower, Dark Blue Torenia · flowering

'Catalina Midnight Blue' is a trailing wishbone flower from the heat- and humidity-loving Catalina series, valued for its deep velvety midnight-blue, snapdragon-like blooms with paler throats. This shade-tolerant warm-season annual flowers continuously through summer, excels in containers and hanging baskets, and thrives where heat and moisture defeat many other bedding plants.

Mature size: 20-30 cm tall and 25-35 cm wide (trailing spread)

Watch for — Powdery mildew and leaf spot: Crowded, stagnant, wet conditions invite fungal disease; space plants and water at the base.

How to tell torenia fournieri 'catalina midnight blue' needs repotting

Repotting on a calendar is less reliable than reading the plant. For torenia fournieri 'catalina midnight blue', 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 torenia fournieri 'catalina midnight blue' 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 torenia fournieri 'catalina midnight blue'

Pot on seedlings as they grow; not a perennial repot. Torenia fournieri 'Catalina Midnight Blue'is grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Mounding to trailing, well-branched warm-season annual that spreads and spills, making it excellent for the edges of containers, baskets and the front of shaded borders..

What size pot to step torenia fournieri 'catalina midnight blue' up to

Pot torenia fournieri 'catalina midnight blue' 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 torenia fournieri 'catalina midnight blue'

Pot torenia fournieri 'catalina midnight blue' 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 torenia fournieri 'catalina midnight blue'

Pot on before it is root-bound. Check torenia fournieri 'catalina midnight blue' 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 rich, moisture-retentive, well-drained soil 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 torenia fournieri 'catalina midnight blue' 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 torenia fournieri 'catalina midnight blue'

Torenia fournieri 'Catalina Midnight Blue' wants rich, moisture-retentive, well-drained soil. Prefers fertile, humus-rich soil of pH 5.5-6.5 that holds moisture yet drains freely. Amend beds with compost and use a quality peat-free potting mix in containers. Poor, dry soil stunts growth and flowering. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting torenia fournieri 'catalina midnight blue' — frequently asked questions

How often should you repot torenia fournieri 'catalina midnight blue'?

Pot on seedlings as they grow; not a perennial repot for torenia fournieri 'catalina midnight blue'. Torenia fournieri 'Catalina Midnight Blue' is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into rich, moisture-retentive, 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 torenia fournieri 'catalina midnight blue' need?

When is the best time of year to repot torenia fournieri 'catalina midnight blue'?

Can you put torenia fournieri 'catalina midnight blue' straight into a much bigger pot?

No. Even a fast-growing torenia fournieri 'catalina midnight blue' 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 torenia fournieri 'catalina midnight blue' after repotting?

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