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best time to plant flax

Wondering about the best time to plant flax in your New Zealand garden? Flax, or Phormium, is one of the most iconic and resilient native plants, favoured for its striking foliage and adaptability. Getting the timing right is key to ensuring your flax establishes well, flourishes, and performs at its best. Whether you're planting a vibrant cultivar such as [Phormium 'Chocomint'](/shop/product/flaxes/phormium-chocomint) or a hardy species like [Phormium tenax](/shop/product/flaxes/phormium-tenax), proper timing will set your garden up for success. Below, we’ll cover when and how to plant flax, and why timing matters in Aotearoa’s unique climate.

Phormium tenax plant in a garden with green foliage.

Phormium tenax

5 from 2 customers

Phormium tenax, commonly known as the NZ flax or Harakeke, is a flax plant that produces erect, green, sword-like leaves. Stems rise above the foliage in summer to bear twisted-looking flowers that result in black seed pods in autumn, and the nectar produced by the flowers attracts both birds and butterflies. Harakeke grows as a clump to about 2 m tall and the same wide, performing best when planted in full sun on a well-drained site. It is a popular landscape option that is also often used to contrast with other plant colours. Mass planting on a bank not only provides an outstanding display but is also excellent for helping to stabilise the soil.

Suited to regions: All regions
Plant type: Flaxes
Height: 2.00 m
Spread: 2.00 m
Flowering time: Summer
Tolerances: Coastal, Extended dry periods, Hardy, Wet, Wind
Garden uses: Banks, Living areas, Parks, Ponds, Pool areas, Specimen
Garden styles: Architectural, Backyard, City & Courtyard, Coastal, Frontyard, Japanese, Mediterranean, Modern, Native, Riparian
A large Phormium 'Dark Delight' plant with elegant, purple foliage.

Phormium 'Dark Delight'

5 from 3 customers

Phormium 'Dark Delight', also known as Dark Purple Flax, is a bold New Zealand native flax prized for its broad, upright leaves in deep purple to bronze shades. This striking ornamental variety brings drama, colour, and structure to gardens year round. Hardy and versatile, it thrives in a wide range of NZ conditions, from coastal sites to urban landscapes. Phormium 'Dark Delight' is an excellent choice for gardeners seeking a low maintenance, architectural feature.

Suited to regions: All regions
Plant type: Flaxes
Height: 1.20 m
Spread: 1.20 m
Flowering time: Summer
Tolerances: Coastal, Extended dry periods, Hardy, Wet, Wind
Garden uses: Living areas, Parks, Ponds, Pool areas, Specimen
Garden styles: Architectural, Backyard, City & Courtyard, Coastal, Frontyard, Japanese, Mediterranean, Modern, Native, Riparian
Phormium 'Green Dwarf' flax plant in a native garden with Oioi plants.
Phormium 'Green Dwarf'

Phormium 'Green Dwarf', also known as Dwarf Green Flax, is a compact, tidy New Zealand flax cultivar with lush, bright green, strap-like leaves. It...

From$8.50
Phormium cookianum

Phormium cookianum, commonly known as Mountain Flax or Wharariki, is a graceful New Zealand native valued for its arching green leaves and tall...

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Phormium 'Emerald Gem' in a native garden.
Phormium 'Emerald Gem'

Phormium 'Emerald Gem' is a dwarf variety of Mountain Flax or Wharariki. It produces emerald-green leaves and grows to 60 cm tall and 70 cm wide in...

From$9.95
Phormium 'Surfer Bronze' plants for sale at The Plant Company nursery.
Phormium 'Surfer Bronze'

Phormium 'Surfer Bronze' is a compact and stylish New Zealand native flax with narrow, upright leaves in rich bronze tones. This striking ornamental...

From$12.95
dianella-caerulea-goddess-
Dianella Goddess

Dianella Goddess is a variety of the commonly known, NZ Flax Lily, and produces upright, strap-like leaves which are a rich, dark green with a blue...

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Phormium 'Jack Spratt' plants for sale at The Plant Company nursery.
Phormium 'Jack Spratt'

Phormium 'Jack Spratt' is one of the smallest New Zealand native flax varieties, admired for its narrow, upright leaves in rich bronze to dark...

From$12.95
Dianella tasmanica (Tasman Flax Lily) plants with green foliage and blue flowers.
Dianella tasmanica

Dianella tasmanica, commonly known as the Tasman Flax Lily, produces upright, strap-like leaves which are a rich, dark green and have a lush...

From$19.25
Phormium 'Surfer' plants in pots for sale at The Plant Company nursery.
Phormium 'Surfer'

Phormium 'Surfer' is a compact New Zealand native flax admired for its striking green leaves edged with bronze and red tones. Its upright, arching...

From$12.95
Sedum rubrotinctum (Jelly Bean Plant) bright red foliage.
Sedum rubrotinctum (Jelly Bean Plant)

Sedum rubrotinctum, commonly known as Jelly Bean Plant or Pork and Beans Plant, is a compact, low-growing succulent reaching 15–20 cm tall and...

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Lagerstroemia 'Best Red' red flowers amidst dark purple foliage.
Lagerstroemia 'Best Red'

Lagerstroemia ‘Best Red’ is a standout crepe myrtle prized for its intense red summer flowers and strong upright tree form. Flowering through the...

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Stromanthe triostar plant.
Stromanthe Triostar (Stromanthe Plant)

Stromanthe Triostar is a popular indoor plant owing to its lush and colourful foliage. It features elegant, dark green, pink, and cream-coloured...

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Chlorophytum comosum variegatum (Spider Plant)

Chlorophytum comosum Variegatum, commonly known as the Spider Plant, is a tender, herbaceous perennial grown for its lush and variegated foliage. It...

From$20.01
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Native Plant Fertiliser (Native Fertiliser)

Selecting the correct native plant fertiliser is essential as they often tend to be slow growing and so require a tailored nutrient plan to meet...

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White flowers on a Cistus 'Snowmound' plant with green foliage.
Cistus 'Snowmound' (White Rock Rose Plant)

Cistus ‘Snowmound’ is a compact evergreen shrub that produces a breathtaking display of pure white flowers with golden-yellow centres from late...

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PB¾ Planter Bags (Planting Bags)

The PB ¾ Planter Bags are 80 microns thick and ags hold 0.5 litres of potting mix. They are durable and won’t rip which makes them great for...

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Carex 'Everlime' plants for sale at The Plant Company nursery.
Carex 'Everlime' (Lime Grass Plant)

Carex ‘Everlime’ (Japanese Sedge) is a popular evergreen sedge valued for its graceful arching green foliage edged with bright lime cream margins...

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Indoor Plant Fertiliser Tablets

Indoor plants require feeding from the time you get them home as nurseries typically only put enough fertiliser in the pots to last 4-8 weeks after...

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A strong and studry planting spade.
Ace1 Planting Spade

The Ace 1 planting spade is a must for any gardener. This spade is designed so it can penetrate the ground easily without jarring the wrists in the...

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Strelitzia nicolai (White Bird Of Paradise Plant)

Strelitzia nicolai (Giant White Bird Of Paradise) is a bold, architectural plant known for its large banana like leaves and striking white and blue...

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Indoor Plant Fertiliser

All potted plants require indoor plant fertiliser. This is particularly important as many nurseries only put enough fertiliser in the pots to last...

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Shadecloth - 70% Shade (Shade Cloth For Plants)

This shade cloth for plants, which is also used as plant windbreaks, reduces light levels and windspeeds by 70%. Therefore, 30% of the wind or light...

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PB8 Planter Bags (Potting Bags For Plants)

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PB2 Planter Bags (Plastic Plant Bags)

These PB2 planter bags are 80 microns thick and hold 1.2 litres of potting mix. They are durable and won’t rip which makes them great for handling...

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PB12 Planter Bags (Grow Bags For Plants)

These PB12 planter bags are 125 microns thick and hold 6.75 litres of potting mix. They are durable and won’t rip which makes them great for...

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Fertiliser for acid loving plants (Acid Fertiliser)

Using fertiliser for acid loving plants is important for plants such as Camellias, Rhododendrons, Azaleas, Daphne’s, Gardenia’s, and Hydrangea’s who...

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A large Monstera deliciosa (Swiss Cheese Plant) in a garden with lush, green leaves.
Monstera deliciosa (Swiss Cheese Plant)

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These lightweight pots are a cost-effective means for growing on plants. They feature a strong and broad rim, have been UV stabilised for NZ...

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PB18 Planter Bags (Grow Plant Bags)

These PB18 planter bags are 125 microns thick and each bag holds 10 litres of potting mix. They are durable and won’t rip which makes them great for...

From$77.47
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1.5 Litre Thermoformed Plant Pots

These lightweight pots are a cost effective means for growing on plants. They feature a strong and broad rim, have been UV stabilised for NZ...

From$27.36
Phormium tenax

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You might be interested in exploring related Latin Names - Dianella, and Phormium, or related Categories - Flaxes.

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When Is the Best Time to Plant Flax?

The best time to plant flax is during the cooler, wetter months of autumn and early spring. In New Zealand, this typically means from late March through to early May, or again from September to early November. Planting during these periods allows young flax roots to establish in the soil before they face the stress of summer heat or winter cold, giving your plants a strong start.

Autumn planting is especially beneficial because the warmer soil temperatures encourage rapid root growth, while increased rainfall means you won’t have to irrigate as frequently. In spring, as the weather begins to warm, flax will quickly put on new growth. Avoid planting in the height of summer, when hot, dry conditions can stress young plants and make establishment difficult.

Regional Considerations for Planting Flax

While the best time to plant flax is consistent across most of New Zealand, consider your local conditions:

Choosing and Planting the Right Flax Variety

With so many exceptional options, choosing the right Phormium can be both fun and rewarding. For bold colour, consider Phormium 'Jester' or Phormium 'Chocomint'. If you prefer a compact variety for pots or smaller spaces, Phormium 'Green Dwarf' is ideal. For a dramatic, dusky look, Phormium 'Velvet Underground' is a standout choice.

When planting, select a sunny to partly sunny spot with well-drained soil. Dig a hole twice as wide as the root ball. Gently firm the plant into position and water deeply after planting. Mulching helps retain soil moisture and suppress weeds while your new flax is establishing.

Ongoing Care for Newly Planted Flax

After you plant flax at the best time, keep an eye on soil moisture—especially if the weather warms unexpectedly. Young flax will benefit from occasional deep watering during their first season. Once established, plants like Phormium tenax are very drought-tolerant and low-maintenance.

For the healthiest, most vibrant flax plants, feed annually in spring with a balanced, slow-release fertiliser and remove any dead or damaged leaves as needed.

Conclusion

The best time to plant flax in New Zealand is during autumn or early spring, setting your garden up for vibrant, healthy growth. No matter which variety you choose—whether it’s the colourful Phormium 'Chocomint', robust Phormium tenax, or compact Phormium 'Green Dwarf'—timing your planting right makes all the difference. Enjoy the beauty and resilience of flax in your garden for years to come.


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Whether you need assistance finding the plant you’re looking for or you simply want to know more about who we are and what we do, we invite you to get in touch with us today. A member of The Plant Company team will get back in touch as soon as possible.

–The Plant Company

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