We typically do not see temperatures in the 20s until December.On the south shore, where temperatures stayed around 30 degrees, damage was likely light overall. Mulch helps.Crotons can be pretty tender, and a prolonged freeze will usually do them in.It's an annual since it's not root-hardy in a hard freeze, but many return year after year. If you find it easier to leave them where they are, be sure to space them apart and position them to get adequate light.Vulnerable plants growing in the ground must be covered. Once there's no danger of a freeze, prune down to the firm, green area of each stem or branch.Will suffer top damage but returns from mulched roots in the spring.Many shrubs will withstand freezing temperatures, and unless temperatures are expected to drop into the low 20s or teens, few cover these shrubs.Some gardeners cover azaleas, especially when in bloom, during a hard freeze. Photo: Douglas Freer, / Fotolia.com

For more severe freezes, minimize damage by providing heat under the cover with small, incandescent outdoor Christmas lights.We have been experiencing cold weather unusually early this year. Start at the top and work your way down to see how far back the plant was killed.Don't get discouraged at this point. Prune back until you reach the green area. Gently remove all soil and loose roots. If you cover them with clear plastic for a freeze, and the following day is sunny and mild, you must vent the cover to prevent excessive heat buildup. How to Revive a Plant After Leaving It in the Cold. After a freeze, remove soggy, freeze-damaged plant material from soft-stemmed plants.Can survive a dip into the 20s without cover. A 4-inch layer of mulch over the ground is all that is needed to protect them.You may remove the damaged foliage from banana trees but do not cut back the trunks unless you can tell for sure they have been killed (usually this takes temperatures in the teens).

But, rest assured, the cover protected the inner part of the plant.To minimize leaf burn, you can lift the plastic cover to keep it off the foliage. Spread begonia clumps on newspaper and leave this in a sunny area until thoroughly dry — about a week.
Cold protection will preserve the life of an in-ground tropical plant -- but not bring it through winter unharmed. https://www.chron.com/life/gardening/article/Plant-by-plant-freeze-information-1766802.php Photo: Douglas Freer, / Fotolia.com A dead trunk will look brown, feel mushy, loose in the soil and will bleed a lot if punctured.Generally, it's a good idea to delay hard pruning of woody tropical plants, such as hibiscus, tibouchina, angel trumpet, croton, ixora, schefflera, copper plant and rubber tree, until new growth begins in the spring, and you can more accurately determine which parts are alive and which are dead. Once they have sufficiently dried, cut away any remaining foliage and gently shake off excess soil. At 32 degrees, damage to the growing points will occur; below 25 degrees, severe freeze damage occurs.Skyflower (Thunbergia grandiflora) will freeze to the ground during a cold winter, so mulch to protect roots. When we cover plants, we do not expect them to come through a freeze in perfect condition. A tomato cage works well, or pick three stakes slightly taller than the plant and drive them into the ground around it before you cover it.Remember, covers usually work well to protect plants from radiational freezes on chilly, clear nights or when temperatures will not go below the mid- to upper 20s. Photo: Douglas Freer, / Fotolia.com Covering plants usually works well to protect from radiational freezes on chilly, clear nights or when temperatures will not go below the mid to upper 20s. Blooms suffer some damage in the 20s, but the plants generally survive.Will suffer considerable top damage, and with sustained below-freezing temperatures, they'll die. It's done more to tidy things up than to benefit the plants. Although you may see a fair amount of damage to landscape tropicals, particularly on the north shore, most of the tropicals are still alive and will appreciate protection as needed through the rest of the winter

In most other parts of urban Houston south of I-10 and inside the loop (perhaps even to Hobby), tropicals will do well in protected areas.
When the time comes to dig up your begonias, simply follow these easy steps: Gradually decrease the amount of water you give your begonias and stop fertilizing them by the end of August. It's typical for the outer leaves to look burned.

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