dark cavities

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Posts: 4
Joined: Fri Jul 26, 2019 2:59 pm
Location: Manitoba

I painted the inside of the compartments with mud but was wondering if there is another way of making them dark? I'm planning for next year. Thanks for any suggestions as this is my second year of being a landlord and I'm quite new at this.
Posts: 625
Joined: Thu Jan 19, 2017 11:15 pm
Location: Plano, Texas
Martin Colony History: See Signature


What type of cavities do you have? Gourds or house?

I use Troyer Horizontals and S&K BO 11 Plus gourds. I found that, with these gourds, I do not have to alter the interior for darkness. Specially the BO11 Plus gourds since they have a black inner shell. This black inner shell also helps regulate temperature.

I took one of my BIg BO gourds and painted the inside with black spray paint. Once I got done with it I had a good long look at it and decided that it may get too hot on the inside as a result of the added paint. I never used this gourd out of that fear so I can't say if that worked or not. I was also concerned with the chemicals in the paint possibly causing respiratory problems in the birds.

A good quality and well constructed gourd doesn't need to be altered to achieve the darkness. Next year I will have all Troyer Horizontal, Troyer Vertical and BO11 Plus gourds. All with tunnels.

Although I did not give a solution to darken your current cavities I hope this will help in your thought process.

Good luck to you.

2016 - late to put up, many visitors
2017 - 1 pair, 3 fledged
2018- 2 pair, 12 fledged
2019 - 4 pair, 21 fledged
2020 - 15 pair, 67 fledged
Posts: 4
Joined: Fri Jul 26, 2019 2:59 pm
Location: Manitoba

I have a wood house and painted the inside with mud which worked but was just wondering if anyone used something else.
Thanks Whippy!
Dave Duit
Posts: 1822
Joined: Tue Nov 25, 2003 2:02 pm
Location: Iowa / Nevada
Martin Colony History: In 2020, 60 pair with 285 fledged youngsters. 83 total cavities available, 58 Troyer Horizontal gourds and 4 modified deep trio metal house units, 1 fallout shelter, owl cages around all units. Martin educator and speaker. President and founder of the Iowa Purple Martin Organization. Please visit www.iamartin.org and join.

Hi DeeCee,
There is no need to darken the interiors with anything.
Mite control, heat venting, predator protection and additional feeding during bad weather add up to success.
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