Shopping for a water softener: 1  Salt-based units need to have the salt replenished on a regular basis, usually at a cost of anywhere from $2-$15 a month depending on the cost of the salt ($3-$8 per 40-pound bag) and the amount of salt used by your system.
Milkweed is the common name for perennial, herbaceous plants of genus Asclepias, family Asclepiadaceae (from Greek physician Asclepius). One hundred species occur worldwide; 13 are native to Canada.
In Canada, there are 14 species of Milkweed known, however, one species-Common Milkweed (Asclepias syriaca)-is by far the most important food source for the Monarch (Crolla & Lafontaine, 1996; Urquhart & Urquhart, 1979).