Blue morning glory
Convolvulaceae - Ipomoea indica

What does it look like?

High climbing vine with tough, hairy, twining, stems. Tough fibrous roots without rhizomes. Leaves (5-18 x 5-16 cm) are usually 3-lobed (trumper-shaped) and silky-hairy underneath.

From late spring to early winter, groups of 3-12 deep blue-purple flowers that are pink at the base and wither in the midday sun are produced. Little or no seed is produced in New Zealand, thus this plant is spread virtually completely by garden dumping and spreading from the affected area.

Why is it a problem?

Blue morning glory has a very fast growth rate and tolerates a wide range of conditions. It does particularly well near water or in high humidity/rainfall areas, hence it is often seen on streamsides in Northland.

It's dense smothering habit and ability to climb to the top of the forest canopy, makes this the dominant vine wherever it occurs. 

Control Methods

Physical control:

  • Hand-pull small plants any time of year, ensuring all stem and root fragments are dug out. Dispose of roots at a refuse transfer station. Ensure any vine matter left behind is not in contact with the ground, as these are likely to re-root and form a new plant.

Herbicide control:

  • Cut and stump treat larger stems (within 10 minutes of cutting) with 100ml glyphosate (360g/l e.g. Round-up®) +1g metsulfuron-methyl (600g/kg e.g. Escort®) per 1L water;
  • Spray with 100ml glyphosate +20ml penetrant per 10L water;
  • Spray with 2g metsulfuron-methyl per 10L water.

CAUTION: When using any herbicide or pesticide, PLEASE READ THE LABEL THOROUGHLY to ensure that all instructions and safety requirements are followed. 

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