Baby, before it gets cold outside, move some greenery inside
If you moved your indoor plants outside for the summer, it is time to bring them back in. You can also bring some of your annual garden inside, either as plants or as cuttings. Sometimes, what we consider an annual plant is a tender perennial. For example, coleus is a perennial in California.
September is the time to get plants ready to be indoors. According to plant-care.com, consider the light requirements of the plant when you decide on its new location. Flowering plants need more light than foliage plants. You may need to move the plant as the winter light becomes less intense.
Dr. Leonard Perry, at the University of Vermont, recommends that you gradually get the plants used to being indoors. Clean your windows to let in as much light as possible. Re-pot overgrown plants in sterile potting soil. Set up trays with gravel to make a high moisture environment when recommended. This is also a good time to take cuttings of annual flowers, such as impatiens, begonias, geraniums, and coleus. They root easily in water or sand and make attractive houseplants. This is also a good way to overwinter them for planting in the garden next year.
To prevent shock when you bring houseplants back indoors, expose plants gradually to reduced lighting. Usually, if they've been in bright light and you move them into much lower light, expect some leaves to fall off. However, new ones should form as the plants re-adapts to the lower light. It’s best if they've been outside in high light to put them in similar light indoors like a south window or under plant lights on a timer for 16 hours a day.
Click here for advice on propagating annual geraniums and several houseplants.
Many popular perennial plants are not hardy enough to survive a Michigan winter out of doors. These plants will go dormant, but you need to supply a safe place for them to rest. The plant experts at Michigan State University say: Before the ground freezes, and after frost has killed the tops, dig and lift roots of tuberous begonia, gladiolus, cannas, and dahlia. Knock excess dirt off the roots and remove foliage, leaving a short stub. Let roots air dry for several days. Store on newspaper or in mesh bags or old nylons or in dry sand, sawdust or peat moss in a cool, dry, frost free garage or basement. Check them occasionally and discard any showing signs of mold or decay.
It is a feat to overwinter plants. A house full of greenery during the winter can make you feel rich and in touch with nature. And, it shows off your green thumb.
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University of Illinois says roses require special care. They need to go completely dormant. Stop using fertilizer after August 15. Stop dead-heading after October 1. Allow the plant to form hips.