Shrubs and perennials with woody stems Rosemary flourishes well in our mild winters, even with a few light frosts for brief durations. Days of single-digit temperatures and wet snow meant the end of the line for even the most established plants. You can remove them at any moment; they will not return. Evergreens are more resistant to low temperatures because their thick needles protect the plant's inner workings - especially the roots - from freezing. Some species, such as Fraser fir, have been known to live for hundreds of years.
The best way to protect plants is by covering them with mulch or soil during winter. This will keep weeds under control and conserve moisture so that your shrub will be ready for spring planting.
If you choose to protect your shrubs with a cold frame or other form of greenhouse, make sure to provide them with some type of protection from extreme temperatures. For example, hot glass bottles can become very hot during summer months, killing sensitive plants immediately.
Some types of shrubs, such as azaleas, rhododendrons, and hydrangeas, are toxic if ingested. Do not eat the leaves or flowers. If you come into contact with any type of poison, call 911/EMS and have someone bring out a protective mask for you until emergency personnel arrive.
As winter draws to a close, gardeners begin to see the toll it takes on particular bushes. She claims that in the winter, evergreen leaves and needles might dry out and die due to a lack of water in the plants' root systems or the roots' inability to absorb water from frozen soil. During cold weather, many plants will develop protective layers of ice over their leaves which prevents any more water from reaching them which can cause the plant to die.
Winter is a difficult time for many shrubs because they cannot protect themselves with a heavy blanket of snow. If there is no source of heat around their roots, they will perish. Even if you manage to keep your shrub alive through one harsh season, don't expect it to be immune to future cold snaps. The best option is to provide your bush with some type of protection from the cold during its dormant period.
The most effective way to do this is with a hedge. A hedge shields vegetation on both sides of its base from wind and rain, which helps these organisms spread quickly along its length. Any exposed parts of the shrub or tree will not grow as large because they are unable to withstand adverse conditions. A hedge also provides support for climbers which allows them to reach maximum growth potential. Without support, they would be unable to spread their branches so far.
Another method used to protect shrubs from winter harm is with a thick layer of mulch.
In the winter, perennials die back. Most perennials die back in cooler areas (though there are some evergreen perennials). They may just become dormant in warmer climates. Year after year, they reappear in the spring and go through their yearly bloom. When they stop producing seeds, then they're considered dead.
Some plants remain alive all year round, such as geraniums and violets. These are called perennial plants. The other category is annual plants which die to seed every year. When you buy a plant at a garden center or supermarket, it will most likely be a perennial. If not, don't worry about it, these plants will never die!
Some perennials can live for several years while others will only live for one season. Some come back each year even after many seasons, while others need to be replanted every year. Perennials that live for more than one season are called biennials while those that live for one season are called monocultures. For example, foxgloves are biennials while daylilies are monocultures.
Some perennials have been known to survive for many years in sheltered spots where they get constant moisture and heat from nearby trees or buildings. If this is the case with your plant, give it a permanent location when you bring it home.