It’s an easy concept to think of the soil as a bank. If you remove nutrients in products sold off the farm, then you need to replace them to keep a state of ‘nutrient balance’ in the bank.
Although blackberry is found in most districts of New Zealand it is mainly a problem weed in Northland, Central and Eastern districts of the North Island, Nelson and the West Coast.
A soft-wooded, bushy and leafy perennial that grows up to 2 metres tall or more. The flowers are green and are followed by dense cylindrical clusters of dark purple berries.
Chickweed (sometimes called field chickweed) is an annual that is low growing and sprawling and can grow up to 70cm across.
Scotch and nodding thistles are common in New Zealand pastures.
Hedge mustard is also sometimes referred to as wireweed or tumble weed.