The blue moon rose variety is a hybrid tea rose plant that is disease resistant. It is hardy to U.S. Department of Agriculture plant hardiness zone 4, which accommodates even the coldest areas in Massachusetts. The blue moon rose plant typically grows to be about 5 feet high and 2 feet wide. With fragrant lavender blue flowers that bloom continuously from June until September, your blue moon rose plant will soon be a beautiful addition to your Massachusetts garden.
Choose a location in full sun and in soil that is rich in nutrients to plant your blue moon roses. To create richer, more fertile soil, which is necessary in most Massachusetts soil, turn over or loosen the top 12 inches of your soil bed and evenly mix in 4 to 6 inches of compost or manure. You can rent a rototiller if you are preparing a large planting bed.
Dig a hole that is enough to accommodate the plant's roots. A blue moon rose plant that came bare rooted should be wide enough to spread out the roots and deep enough so the bottom of the stem is just beneath the top of the soil. For a container blue moon rose plant, dig a hole that is the same depth as its current container. Space holes about 2 feet apart.
Sprinkle 1 to 2 tbsp. of rose fertilizer at the bottom of each hole. Follow the dosing instructions on the label for the exact amount needed for your particular brand of fertilizer.
Backfill the soil and gently pat it down as you go. Do not pack the soil too firm, but just enough to remove large pockets of air, which can later cause root rot.
Water your rose plant after planting with 1 to 2 inches of water. Then, if rainfall is scarce, continue to water once or twice a week with an inch of water. In the middle of the summer when days are hot in Massachusetts and soil dries out more quickly, you may need to water your blue moon roses three to four times a week, especially if you are experiencing a drought. Water at the bottom of the plant rather than the top, where you can harm the blooms.
Pinch off the flowers as they wilt to encourage more blooms, which will last until the first hard frost, usually in September in Massachusetts.
Lay 4 to 6 inches of mulch in the fall around late September or early October in Massachusetts. Use rotted manure or compost to continue to create a fertile soil bed for your blue moon roses.
Prune your blue moon rose plant in March. Cut it back so it is only 8 inches in height. Also, remove weak and damaged limbs. Pruning will help your rose plant grow wider and fuller.