How (and When) to Trim Back Gaura in Winter

on 24 July 2025, 11:05

Gaura, also called Gaura lindheimeri or “Whirling Butterflies”, is a favourite for good reason. It flowers for months, handles drought, and brings a soft, airy feel to the garden with its delicate blooms. But after a full summer of performance, it can look tired by winter.

This is the perfect time to tidy it up and get it ready to bounce back even better in spring.

Why Your Gaura Needs a Winter Cut-Back

In New Zealand’s climate, Gaura acts like a short-lived perennial. It flowers profusely through summer and autumn, then goes dormant or semi-dormant in winter, depending on your region.

Cutting it back in winter:

Removes old flower stems and tatty foliage
Prevents it becoming woody and leggy
Encourages new growth from the base, not halfway up the stems
Keeps your garden looking tidy through winter

This method applies to many similar perennials too, like Salvia, Penstemon, and Achillea.

Best Time to Cut Back Gaura

You can prune Gaura anytime from mid-June through to late August. Just make sure it’s done before new spring growth begins.

If you wait too long, new shoots will sprout higher up the stems. That leads to woody, untidy plants that don’t flower as well.

How to Cut Back Gaura the Right Way

What you’ll need:

Sharp secateurs
Gloves (optional)
A green bin or compost for the offcuts

Step-by-step:

Find the flower stems
By winter, the flowers are spent and you’ll see thin, dry stalks rising above the main bush.
Cut back into the bush
Don’t just snip off the flower stems. Trim back slightly into the leafy part of the plant - about 10-15 cm into the mound.
Shape the plant
Aim for a rounded, low shape. This gives the new shoots room to grow up evenly in spring.
Clear away the debris
Remove any old foliage or stems from around the plant to avoid rot or fungal issues.
Leave it alone
No need to fertilise or water unless your area is very dry. Gaura likes things lean in winter.

What Happens Next?

After trimming, your Gaura might look like a stubby little mound of green stems. That’s perfect.

In early spring, new growth will push up from the base. By late spring to early summer, it will start flowering again, often right through until autumn with minimal care.

Regular deadheading through the season can extend flowering even further, but it’s not essential.

Where Gaura Works Best in NZ Gardens

Gaura thrives in:

Full sun and free-draining soil
Coastal sites and exposed areas
Gravel gardens and dry borders
Mixed perennial beds for movement and softness

It’s a great fit if you want:

Long-flowering plants with minimal fuss
A light, airy look to balance bold foliage
Drought-tolerant options for modern NZ gardens

It pairs well with:

Quick Tip: Use This Rule for Other Perennials Too

The same trimming rule works for many summer perennials. If it looks scruffy now and dies back fully in winter, you can often cut it back hard.

Try it on:

Just be sure to identify each plant properly before cutting - some shrubs and evergreens don’t like hard pruning at the wrong time.

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