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The Monarch Butterfly, once a staple in summer gardens have virtually disappeared.Their population of once nearly 1 billion has seen a 90% decrease. Due in part to deforestation in Mexico and California, the hibernation destination for the creatures, the rest of North America is killing Asclepias (Milkweed) which is the one host plant for the Monarch. The Monarch Caterpillars only eat and lay eggs on Asclepias. We can plant as many necatar plants as we want, but without the proper host plants the population will never grow.