Anchoring Responsibly: Seagrass and Coral

Posted on April 10, 2026 

  

Two of the more difficult bottoms in which to anchor—weeds and coral—are also considered “sensitive bottoms,” locations in which you should do no harm. 

Understanding Weedy Bottoms 

In weedy bottoms, the weeds can run the gamut from sparse to dense, while the weeds themselves can range from long, tough or fibrous, to short, weak or stringy. Any of these can also be slippery enough to defeat many anchors. 

In this article, the terms “weeds” or “weedy” are used to collectively refer to any of the various types of vegetation that can be found growing in a seabed. 

When weeds are too dense for an anchor to pierce through to the seabed, the anchor only has the weeds to hook into—a tenuous hold at best. When the wind becomes strong enough, often less than you think, the anchor will pull out, damaging all that it rips through. 

Because of this problem, it is best to search for an area that contains no growth. Then, no matter how small that spot, get your anchor set there—not in the weeds. Though this is not always as simple to do as it is to write about. 

Techniques and Challenges 

The often touted technique to dive on the anchor to set it might work where the water is:  

• Warm 
• Shallow enough 
• Filled with short or fragile weeds 

It also helps to be able to hold your breath long enough to do so. 

Otherwise, this technique is usually not practical—many times not even possible. 

A Better Approach: Fisherman-Style Anchors 

The good news is that there is a better approach:
There is one anchor design that is reliable in weeds—the fisherman-style anchor. 

Paul Luke, a highly regarded manufacturer of fisherman-style anchors, suggests choosing these anchors based on weight:  

• At least two pounds of anchor per foot of boat length 
• Usually adequate through storm-force winds (in sand) 

However, these anchors might benefit from being heavier:  

• ½ to 1 pound heavier per foot in higher winds 
• Useful where there is poor protection from seas 
• Beneficial in very soft bottoms 

Why Weight Matters 

For use in long or dense weeds, weight is a considerable advantage. It enables this style of anchor to more reliably crush down through the weeds and reach the seabed. 

It is better to have one of these anchors that is too heavy, rather than too light. 

Yes, these anchors are challenging to:  

• Deploy 
• Recover 
• Stow 

But they provide the security to do the job when other anchors cannot. 

Key Considerations 

With fisherman anchors, there are generally two concerns:  

1. Rode wrapping around the lazy arm 
2. Tripping when side-loaded 

To eliminate these risks, deploying the anchor appropriately is essential. 

Yes, that means that you might need to carry two of these anchors! 

Real-World Example 

On a 34-foot heavy displacement trawler:  

• A 70-pound Luke anchor is used as the primary grass and storm anchor 
• A 100-pound Luke anchor is also carried 
• Several other anchor designs are onboard 

There have been times when:  

• The larger anchor was necessary 
• Both anchors had to be deployed 

While handling them can be difficult, their reliability makes them indispensable. 

Fortunately, fisherman-style anchors like the Luke and Kingston can be disassembled into three manageable pieces. 

Preparation is Essential 

If anchoring in weeds is a possibility, you must:  

• Obtain all appropriate gear ahead of time 
• Have everything onboard 
• Plan how to deploy, recover, and stow it 
• Be willing to put in the effort regardless of inconvenience 

Anchoring in Coral: A Strict Warning 

Anchoring in coral is a flat-out no-no. 

Even the slightest damage to coral is harmful to the ecology, and cumulatively, the damage can become an ecological disaster. 

Responsible Alternatives 

If possible:  

• Locate areas free of coral and anchor there 

If the rode would lie on coral:  

• Attach flotation along the rode 
• Size and space it to keep the rode above the coral 

Yes, it is extra work—but ecologically worthwhile and less damaging to your equipment. 

If Damage Cannot Be Avoided 

If anchoring with zero damage is not possible:  

1. Use an existing mooring (if available) 
2. Anchor in depths of 100 feet or more, where coral does not grow 
3. Go elsewhere 

Final Thought 

Anchoring safely without inflicting damage to the environment is our responsibility as boaters. 

We should all do our part.