Choosing the right nesting materials for native Mason and Leafcutter bees is crucial for their health, habitat adoption, and overall success. The materials you provide can impact everything from bee care to cocoon collection. When I first dove into this topic, it felt overwhelming with so much to consider. In this post, I’ll share what I’ve learned and some valuable lessons along the way!
Necessary Nesting Materials
There are really two primary things that you need to provide a home for native Mason and Leafcutter bees: a house and nesting tubes or blocks.
Native Bee House
The house serves as a container for the nesting materials, and provides protection from the elements and predators. Houses can be purchased from suppliers pre-made, or you can make one yourself. Ideally, the house should made of cedar wood for pest, mold, and fungus resistance.
Wood Trays or Nesting Tubes
Wood trays and nesting tubes provide the cavity spaces bees need to make their nests. The bees will sleep here overnight, and this is where the babies will build their cocoons.
So what’s the difference between them, and how do you choose the right option?
Wood Trays
Wood trays are blocks of wood with holes drilled through them. One block will have several aligned rows of holes. Each row of holes is split right down the middle, all the way from front to back. They are usually held together with heavy duty rubber bands, with one end being covered in a layer of foam held in place by a piece of cardboard.
Wood trays are reusable for several seasons, and can be separated easily for cocoon harvest and maintenance. I was so excited to use these, but I found that my bees prefer the circular tubes over the trays. Now, all I do us use phragmite reeds (more on this below). Give ’em what they want!
Nesting Tubes
Nesting tubes are individual tubes that are usually packed into the bee house to provide space for nesting. The tubes can be made from manufactured materials, like cardboard and paper. They can also be made of natural materials, like phragmite reeds.
If you are using nesting tubes, there are a few characteristics you want to get right to encourage your bees to adopt their home:
- Nesting tubes for Mason and Leafcutter bees should be about 6 inches long.
- Nesting tubes should have a node or blockage at one end to prevent pest intrusion from the back.
- Officially, Mason bee tubes should be 8mm in diameter, and Leafcutter bee tubes should be 6mm in diameter.
- Tubes can be made of phragmite reeds, cardboard, or rolled paper.
My Nesting Material Preferences
My go-to nesting material is phragmite reed tubes, because the bees clearly prefer them. I’ve repeatedly watched mason and leafcutter bees choose these smooth, round tubes over other options. The reeds also have naturally occurring nodes that seal off one end, offering built-in protection for developing cocoons.
Phragmite reeds are easy to open for cocoon harvesting and cleaning, which helps improve survival rates year after year. Since phragmites are an invasive plant, using them as nesting material is also a practical and sustainable choice.
Although there are official tube size recommendations, my bees haven’t read the rulebook! I’ve seen both species use a range of tube sizes, even those considered less than ideal. Because of that, I focus less on perfect sizing and more on providing options.
I always provide more nesting tubes than the bees will need. Too few cavities can discourage nesting, while extra tubes can be cleaned and reused in future seasons.
Important note: I avoid drilled wood nesting blocks because the holes can’t be opened for maintenance or cocoon harvesting. Bees must also expend extra energy cleaning out old holes before they can nest again. Since I raise bees and collect cocoons to improve survival rates, I prefer nesting materials that are easy for bees to use, and easy for me to maintain.
How Much Nesting Material Is Enough?
When selecting nesting materials for native bees, it’s helpful to understand how much space a single cavity-nesting bee may use. With 6-inch phragmite reeds, one female bee can fill three to six separate reeds in a season, with each reed typically containing five to six brood chambers sealed in sequence.
Because of this, even a small number of bees can quickly use up available nesting space. To avoid overcrowding, I aim to provide three to five nesting tubes per cocoon. If you prefer wood nesting trays instead of reeds, be sure to offer enough trays and channels to meet the same need. Providing ample, well-sized nesting materials for native bees supports healthier nesting and better reproductive success.
Optional Nesting Materials
If you’re taking a more hands-off approach—or simply want to better understand what native bees naturally seek out—it helps to know what materials they use in the wild.
Mud for Mason Bees
Mason bees rely on mud to seal each nesting chamber and protect their developing young. In nature, they gather this mud from damp soil near puddles, garden beds, or stream edges. If mud is scarce, mason bees may struggle to complete their nests or abandon them altogether.
Early on, I provided mud for mason bees; but over time I realized they weren’t using it and were sourcing their own. I’ve since stopped providing it, though different environments may require supplemental mud.
Soft Leaves for Leafcutter Bees
Leafcutter bees use pieces of soft plant material to line and seal their nesting chambers. They often source these materials from a variety of common plants—sometimes native, sometimes ornamental or cultivated—leaving behind neat, half-moon cutouts on flower petals or soft leaves from plants like roses, redbuds, lilacs, or peas. While this can look like damage at first glance, it’s actually a sign that leafcutter bees are active and thriving, and healthy plants recover quickly.
In my New England yard, they have no trouble finding what they need in the surrounding landscape, so I don’t need to provide additional materials. In areas where suitable soft plant material is limited, some people may choose to intentionally provide access to appropriate plants. Otherwise, allowing leafcutter bees to gather materials naturally supports their instinctive behavior and helps them settle comfortably into the landscape.
Buyer Beware: Box Stores and Amazon
Big box stores and Amazon are convenient places to shop—but they’re rarely ideal for sourcing native beekeeping supplies.
Many of these retailers sell “bee hotels”: small, decorative wooden structures filled with tubes, slots, or drilled cavities intended for nesting. They’re undeniably charming, and it’s easy to see why gardeners are drawn to them.
Unfortunately, these designs tend to prioritize appearance over bee health. Here’s where they fall short.
Hard to Maintain
Healthy native bees depend on nesting materials that can be removed, inspected, and cleaned when needed. Many commercial bee hotels use tubes that are glued in place, making proper maintenance nearly impossible without damaging the nest or harming the bees inside.
Incorrect Cavity Dimensions
Bees thrive when nesting cavities are the right length and diameter, but most store-bought bee hotels don’t meet those needs. Many are only 2–3 inches deep—about half the depth solitary bees require. The cavities are also often too wide, which can lead to poor nest success and increased pest pressure.
These hotels commonly rely on bamboo tubes or drilled wood. Bamboo is almost always too wide for native bees, and drilled wood makes cleaning and long-term maintenance impractical.
Problematic Nesting Materials Sold Online
On Amazon, you’ll often find products marketed as “native bee nesting tubes.” Many of these are bamboo tubes intended for crafts, not beekeeping. Bamboo is difficult to open, making inspection and cleaning challenging. Even when tubes are made from better materials, they may still be the wrong size—or lack a closed node at the back of the tube. Without that natural seal, parasites can enter the nest and harm developing bees or steal their food.
For these reasons, it’s important to be very selective when sourcing nesting materials, especially from large online marketplaces.
A Practical Workaround for Open-Ended Tubes
Not all Amazon purchases are a total loss. In one case, I bought nesting tubes that were the correct diameter but lacked a closed node at the back—a critical feature for protecting developing bees from parasites and intruders.
Before settling on a solution, I experimented with a few options. I tried using bee mud, after seeing it suggested elsewhere, but found that it crumbled too easily and didn’t hold up in practice. I also came across suggestions for clay plugs, which may work for some setups.
What ultimately worked best for me was using baby nasal aspirator foam rounds to plug one end of each tube. The foam creates a blockage similar to the standard foam backing used with nesting trays, but fits inside the tube the way a natural node does. In use, this functions just as effectively as a natural node in phragmites reeds. Bees readily accepted the tubes, and the sealed ends provided reliable protection.
This solution is simple, inexpensive, and easily repeatable, which is why I’ve continued using it. It’s important to note that this workaround assumes the tubes are already the correct length and diameter. It won’t compensate for tubes that are too short or too wide—but for properly sized tubes that simply lack a node, it’s a solid and effective fix.
Final Thoughts
Supporting native Mason and Leafcutter bees doesn’t have to be complicated. A little thoughtfulness goes a long way. When you choose nesting materials that are easy for bees to use and easy for you to care for, you’re creating a space where they can truly thrive. Pay attention to what your bees seem to prefer, stay curious, and don’t stress about getting everything perfect. When native bees feel comfortable, they’re wonderfully capable of taking it from there! 🐝
All photography by @heldthrulightbyjw
