Station 2: Water quality affecting the growth of Water Hyacinth

Factors that affect growth of Water Hyacinth

Water hyacinth best grows in ponds or slow moving water bodies, such as rivers, dams, lakes and wetlands, in tropical to temperate climates. It can survive frosting but requires temperatures above 10 degrees Celsius for growth, with optimal growth occurring between 28 ˚C and 30 ˚C, but not exceeding 35 ˚C.

Water Hyacinth can grow well in water of pH range from 4.0 to 8.0. It can also survive in water with salinities up to 15 per cent that of sea water.

Although water hyacinth will grow in almost any water body, including low-nutrient conditions, it requires abundant nitrogen, phosphorous and potassium for optimal growth. So, water hyacinth plant loves water bodies with high-nutrient levels, such as those found downstream of agricultural or urban areas.

When the water quality fits the water hyacinth, it can grow very quickly and completely take over water bodies if left unchecked. Its population can double just in two weeks.

Information adapted from: http://www.weeds.org.au/WoNS/waterhyacinth/docs/47053%20ERGO%20Weed%20Mgmt%20guide%20WATER%20HYACINTH_web_FA.pdf