When the Texas sun starts warming up, so do our ambitions. Lawns get mowed, flowerbeds get fluffed, and the quest for the prettiest and greenest yard on the block officially begins. But in the rush to make things lush, it’s easy to assume that if a little fertilizer is good, then a lot must be better.
Science says otherwise.
Fertilizer is meant to supply concentrated nutrients, mainly nitrogen and phosphorus, to plants. When applied correctly, it encourages healthy growth.
However, too much fertilizer can stress or even damage your lawn. More importantly, whatever your grass doesn’t absorb doesn’t just disappear; it moves.
When we use more fertilizer than plants can absorb, the excess can wash away with rain or irrigation. It flows into storm drains, ditches, creeks, and eventually into lakes and reservoirs, many of which provide our drinking water. For homeowners near lakes, streams, or drainage areas, this path is especially direct.
Here’s where the “it won’t hurt if I do it” mindset becomes a problem.
One over-fertilized yard might seem insignificant. But when entire neighborhoods apply just a little extra, that collective runoff adds up. And the cumulative effect on water quality can be significant.
In lakes and reservoirs, excess nutrients promote the rapid growth of aquatic plants and algae. This can lead to clogged boat propellers, murky water, and unpleasant smells.
More seriously, nutrient overload can cause harmful algal blooms, including golden algae, which has been linked to large fish kills in Texas waters, such as Lake Granbury. These blooms harm aquatic ecosystems and can make water treatment more difficult.
The main point is clear: fertilize intentionally, not just with enthusiasm.
Here are some smart fertilizing tips that protect your lawn and your water:
- Follow the label exactly. Application rates and timing are based on research. More is not better; it’s wasteful.
- Test your soil before fertilizing. You may already have enough nutrients.
- Avoid applying fertilizer before or during rain. Water will wash away nutrients before plants can absorb them.
- Keep fertilizer away from surface water. Leave buffer zones near lakes, streams, and storm drains.
- Select organic, no-phosphate, or slow-release products whenever possible. This helps prevent rapid nutrient runoff.
- Plant native vegetation. Native plants usually need less fertilizer, water, and chemicals.
- Maintain vegetative buffers. Plants along shorelines, slopes, and driveways filter runoff before they reach waterways.
- Keep grass clippings out of streets and storm drains. As they decompose, clippings release nutrients, acting like unintended fertilizer.
A vibrant lawn and a healthy water supply can coexist. With careful use and some restraint, we can achieve both.
Because while one extra scoop might not seem like a big deal, thousands of extra scoops across a watershed definitely are.