Some people dislike this little climber, considering it “weedy”.
I’m fond of it, myself.
Slender water vines are chaotic plants with a tendency to spread at will through the garden. They grow very fast, in spring, creating the impression that they will smother everything in sight - but they never fulfil the promise. The growth slows right down as soon as they begin flowering in summer - which happens when the stems are 2-3 metres long. The plants trail through the foliage of other plants, ornamenting them with these pretty leaves. The flowers are tiny and white, but add to the lacy appearance of this delicate-looking plant. They are followed by bird-attracting black fruits.
In autumn the above-ground parts of the vine die, and are easily pulled off their supporting plants by hand. Under the ground, they survive as tennis-ball sized tubers, to regrow in spring.
The brown tubers are edible, as are the tiny fruits, though neither has much flavour. The tubers were traditionally prepared by beating and roasting.
A very good reason for growing these plants is that they are the favourite host plant of the Joseph’s coat moth. This stunningly beautiful day-flying insect is often mistaken for a butterfly, as it is brightly coloured - black with red, yellow, and light blue markings, and the plant would be an appropriate inclusion in a garden designed to attract butterflies.
This female is probably laying eggs on this plant, which , as you can see from the poor state of its health, must have been treated with glyphosate, so if she did indeed leave eggs there they are doomed.