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Control of Bindweed with (Calystegia spp, convolvulus arvensis) Roundup Pro Biactive


Hedge Bindweed (Bellbine): Calystegia  sepium , C.silvatica or C.pulchra
Field Bindweed
Convolvulus arvense

These species are all climbing/trailing/scrambling herbaceous perennials with bell-shaped white or pink flowers and triangular leaves. They are all troublesome garden weeds, spreading over railways, waste ground and in hedgerows and fields. The species are widespread with Bellbine preferring damp areas like marshes and river banks and Field Bindweed occurring most widely on calcareous or neutral soils in the south of Great Britain.


Bindweed spreads mainly by swollen underground roots or rhizomes. Fragments of broken rhizomes root readily and can spread when soil is moved.

Spread by seed is only important with Field Bindweed, which is self pollinating. The Calystegia species are self infertile and rely on long-tongued insects for any cross- pollination.

Control With Roundup Pro Biactive

Established shoots
Treat at maximum growth, around flowering in July - August   before die-back.
New growth among garden plants
Treat when 10-20cm growth (before it climbs plants) need to treat regularly as shoots appear, from late April - September
Grow up canes which can be pulled away from shrubs etc so that the spray is safely directed onto the weed.

Caution: First treatment may cause even more shoots to appear, since it breaks the dormancy of underground buds.

Remember always to take a planned and programmed approach to weed control in such areas – one well timed application may kill off all those weeds present but if no follow-up activity is carried out weeds will simply re-infest the area and within a few years it will have reverted to its original state. 

Rates, Timings and Water Volumes

MethodDose Rate of Roundup Pro BiactiveDose Rate of Roundup ProBiactive450Application Advice
Foliar Spray 5l/ha in 200l water 4l/ha in 200l water

Spray as weed is flowering, but before die-back.  Typically June/July.  Spray any re-growth with same rates before end October.

Weed Wiper 1 part Roundup Pro Biactive in 2 parts water 1 part Roundup ProBiactive450 in 3 parts water Apply with a weed wiper or paintbrush.

Spot Treatment in Knapsack Sprayer

Most knapsack sprayers are supplied with a set of 4 deflector nozzles giving different swath widths but all delivering 200l/ha of water at 1 bar pressure and a walking speed of 1 metre per second.

Area SprayedRate of Roundup Pro BiactiveRate of Roundup ProBiactive450Volume of Water
50 Square Metres 25ml 20ml 1 litre
500 Square Metres 250ml 200ml 10 litres
1,000 Square Metres 500ml 400ml 20 litres