Credit: The Spruce / Almar CreativeKey PointsEpsom salts can boost rose blooms, making flowers larger and brighter.Magnesium and sulfur help plants absorb nutrients and produce chlorophyll.Test your soil first before applying epsom salts to roses.Roses can be one of the longest and most consistent flowering plants in your garden. Depending on the variety, you could enjoy blooms from late spring well into the fall. But roses are also known for be…