I thought my hot tub enclosure would stay warm enough, well no ice on the plants, but it appears that the soil is frozen, I'll find out in a few days when it warms up.

We are just thawing after 4 days of it here - trees and branches down, thousands still without power from electric wires being taken down. Fortunately, our plantings can take it, and garden season has not begun. GREAT that you put the lights around those plants you could!

Crazy freeze has officially reached here. This happened to my neighbor's pine three hours ago. I heard it snap. Missed my car and carport by a mere foot. I don't know how it missed my power line, but glad it did.

My raspberry bed is looking almost artistic. Ditto my "petrified" roses. Both are tough, thankfully.

A floodlight (s) and/or some of those caged lightbulbs mechanics use under a supported blanket, (not plastic!), and BEWARE of fire, or even overheating, will help....Xmas lights do not give off enough heat.....the roots need protection the most, dead/damaged tops can be trimmed & will regrow....remember heat rises,so put lights around the roots, rest your blanket safely atop the foliage.

We are expected to get colder as the day goes on, we haven't gotten above zero in two days. Currently -11. Supposed to get down to -20 tonight. Yeah, I'm so over winter.

Couldn't wash my hands at either end of the house . looks like my pipes are frozen .

Ooh, your 18° is headed our way. Hovering just below freezing here, now, but tomorrow night is expected to dip to around 16°.

There may be some wind leaks in the garage, You might want to elevate them on wood so the cold floor doesn't hit too hard. I had coffee plant and 2 lemon trees arrive during a blizzard in Iowa. They were in bags with water and arrived as blocks of ice. 3 years later, I still have them. They can survive being frozen, but, you may lose most of the leaves. Yes, I am growing lemons in Northern Iowa. (and grapes are about ready to harvest)

Incandecent light bulbs do generate heat . Some of the newer ones , not so much .

Row covers will provide significant protection if properly installed, don't count your plants out just yet, they will probably bounce back.