Yel­low gin­ger

Hedy­chium flavescens

NZ Lifestyle Block - - Contents -

Lo­ca­tion: most com­mon in warmer ar­eas of the North Is­land and in the Nel­son–buller re­gion. Dis­tinc­tive fea­tures: gin­ger scent, large trop­i­cal leaves (50x10cm) that point up­wards, of­ten mis­taken for canna lilies

Yel­low gin­ger sur­vives pretty much all con­di­tions, even im­mer­sion in the sea, and spreads eas­ily, re­plac­ing ev­ery­thing around them.

The plant has mas­sive taro-like rhi­zomes close to the sur­face that are long, shal­low-rooted, multi-branched, and grow over each other to form deep beds. Each rhi­zome seg­ment usu­ally pro­duces an aerial stem each year, up to 2.5m high, which thicken to a short pink­ish ‘col­lar’ at the base. Flow­er­heads (15x10cm) with cream coloured flow­ers over­lap­ping in cone-like clus­ters are pro­duced in May to June, but no fruit is pro­duced.

HOW TO KILL IT

Cut down and paint stumps (all year round): cut above pink ‘col­lar’ at the base and ap­ply glyphosate (250ml/l) or met­sul­furon-methyl 600g/kg (1g /L). Leave stems and leaves on site to rot down.

Dig or pull out small plants (all year round). Do not com­post, leave on site to rot down, or hang rhi­zomes in trees as they sur­vive in­def­i­nitely. Dry them out and burn them, or dis­pose of them at a refuse trans­fer sta­tion.

Spray dense patches (away from roots of vul­ner­a­ble species) all year round, use met­sul­furon-methyl 600g/kg (5g/10l knap­sack) nap­sack) and add pen­e­trant in win­ter. Don’t re­plant sprayed sites for 6 months.

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