It will weather fine=As long as it is standing upright like on the sides of barns.Not strong in the long run (like if hit hard with something,or kicked by horse /cow.) But it will not rot off in your lifetime.If it touches the ground it rotes same as pine,maybe faster.If you lay it flat or use like lap siding it will be rotten in a couple of years most. Sealing it will make it last much longer.
By the way it turns ugly brown color quick(gray in a couple of years)!Unless you coat it with a colored stain.
My moms barn is covered with cull popular from the saw mill i worked for,for 5 years.Its is holding up great with a light colored stain on it.Note it doesn't touch the ground.Frame work that touches the ground is red oak!
To be specific with our weather here a 4x4 mail box post will rote off and fall over in 1.5 years! Takes about as long for a pick nick table to fall apart!
The reason i used popular instead of oak was that this popular was completely purple in color. (From minerals in the ground,where the trees grew.)I was hopeing some one would come up with a way to preserve the color.But no one i new ever did.
That stuff was beautiful! Would have made beautiful furniture if you could stop it from turning brown.In case your wondering. Its fairly common to see a purple colored log here every once and a while.Not from metal in it,just from the ground minerals.I assume iron ore.
