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.
The monarch's larval host plant is the milkweed (genus Asclepias), of which there are more than 100 species across North America. Milkweeds grow most abundantly in disturbed habitats such as agricultural landscapes and along roadsides, but they are in decline for several reasons.hile other butterflies, including others in the Danainae family (the milkweed butterflies), migrate, the monarch is the only butterfly species in the world to undertake a long-distance roundtrip migration.