Yes, I think you can. I know butterflies LOVE magnesium.
They sell "salts" for butterfly water dishes.
I've had them sit on me, and lick my skin on vacation when I took high dose magnesium!
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First and foremost, puddling is when quite a few butterflies congregate at the wet edge of sandy areas or mud puddles. Since flowers are butterflies main source of food, there is not a lot of nutrients in flower nectar. Puddling is when males (mostly) get together and feast on extra salts and other nutrient found in the water around sand. These nutrients are then passed through the male’s sperm when they mate and the female uses these same nutrients to reproduce.
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from
http://www.thebutterflysite.com/butt...behavior.shtml
http://221.135.191.194/butterfly/bgardening_faq.php
If you spread it around and not pour in one place... seems plants like it too:
http://forums2.gardenweb.com/forums/...054611573.html
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Weezie looking at petunias 8.25.2017
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