Will the Weeds Come Back? And Other FAQs
Aquatic weeds can be a real challenge for pond and lake owners. Many of our clients have the same questions: “Will the weeds come back?”, “How often should I manage them?”, or “Can I just use chemicals?”
To help answer these common queries, we’ve put together this blog. Our aim is to explain how different weeds behave, why timing and technique matter, and how our mechanical removal methods can keep your waterbody healthy without harming the ecosystem.
Will the weeds come back?
Mechanical removal is a safe, environmentally friendly approach that removes the bulk of the weeds while protecting wildlife and water quality. Because the roots remain, some regrowth can occur, but with regular maintenance and the right strategy for each species, weeds can be effectively controlled year after year.
How often should weed removal be done?
The frequency of removal depends on several factors, including the weed species, the size of the waterbody, and local conditions. Some weeds, like duckweed, grow extremely quickly in warm weather and may require multiple removals over a season. Others, such as Canadian pondweed, grow more steadily and can be managed less frequently.
Do different weeds need different techniques?
Yes - and timing is crucial. Each species behaves differently, and removing them at the right time of year increases the effectiveness of the work. For example:
Australian swamp stonecrop (New Zealand pigmyweed) is best tackled in late summer, when water levels are lower and the plant is less vigorous.
Duckweed spreads rapidly in warm weather, so early intervention in spring and early summer helps keep it under control before it blankets the surface.
Curled pondweed grows strongly in spring, making management at that stage most effective.
Understanding the growth cycle of each species allows us to put together a plan that minimizes regrowth and keeps your waterbody clear.
What happens to the removed weeds?
Our mechanical removal method clears the water of weeds, but it is the customer’s responsibility to collect and dispose of the plant material. It is important not to leave fragments in the water or compost them on-site, as this can allow weeds to take root again and undo the work. Following this step is key to maintaining a clear, healthy waterbody.
Why not just use chemicals?
Chemical treatments might seem like an easy fix, but they can cause long-term harm to the environment. Chemicals can damage ecosystems, affect fish and wildlife, and do not always solve the problem permanently. That is why we rely on mechanical removal only - it is safer for wildlife, preserves water quality, and gives you greater control over the long-term health of your pond or lake.
Can I do anything to reduce weed growth?
Yes! While mechanical removal keeps your pond or lake clear in the short term, preventative measures can reduce how quickly weeds return. Keeping nutrient levels low in the water is key, as high nutrients encourage fast weed growth. Simple steps include avoiding runoff from fertilised land, managing leaves and debris entering the water, and controlling sediment build-up. Regularly inspecting your waterbody and tackling weeds early in their growth cycle also helps prevent them from spreading.
The bottom line
Aquatic weeds are persistent, but with the right approach they can be effectively managed. Mechanical removal combined with regular maintenance ensures your pond, lake, or watercourse stays healthy, usable, and visually appealing. If you are unsure which weeds you are dealing with or the best time to remove them, our team can help identify the species and put together a tailored management plan for your site.