Time to get rid of these plants?
 

or can we just cut the dead parts off?

thank you.

I would cut off the dead spots and see if it comes back.

I'd cut off the damage and wait there still what looks some green healthy leaves.
The first plant pictured looks much better than the second

Looks like Ann Marie Lantana's (CORRECTION! PENTAS) ??? We have about 9 of them in our brand new landscaped area. All but one has turned to dust. ONE has 1 stem with 4 green leaves remaining but the rest of ours are definitely deceased. Yours seem to have some life left. In our case there is no chance they will come back as when you touch the stems the pulverize. Pretty flowering plants but the company who did it should know they aren't "cold friendly" or at least given us a warning and another option. My wife asked for "color" and that they are, I mean were! "They" say wait until late March and see if any come back. Ours won't.

I agree.

Yes, 86 them. They are pentas not lantana. Inexpensive to replace. Last frost date for zone 9a is March 10th.

Yep, upon blowing up the photo I see my error. I switched the names as we have both. 4 Pentas and 9 Lantana's and our Pentas are also dead as our Lantana's. Guess around here they become annuals and not perennials. :(

Can you suggest a "pretty" flowering plant that can survive one or 2 nights of freeze? These obviously could not.

This is the remnants of ours. Barely identifiable. RIP :pray:

Dianthus and salvia and pansies are a safe bet for now. Good luck!🍀

Wait until March. Some of those plants appear to have some green at the base. They may come back after cutting off dead parts in March. Many of the plants we grow here in The Villages are not dependably hardy such as tropical hibiscus, cardboard palms, Thai plants, crotons, etc.. I was on a bike ride recently, out in the country near here, and saw a number of good sized Bismarck palms turned all brown. They are rated for zone 10. We are 9A which is even colder than 9B (Orlando) so if a real cold winter shows up many plants that are marginally hardy here will die. We have been lucky these past few years.

That is what we are doing with ours.

It may look unsightly, but having any new growth come up through the dead bits gives it support and some protection from the cold.

March is quite soon enough to take away the brown, if you even need to by then - it could be totally covered by lovely green!

I have had both of these and found that cutting everything off a couple of inches off the ground, often results in regrowth of the plant. Especially the weed Lantana.

They are Pentas a perineal that can be cut back and usually will regrow. A lot of people treat them as annuals.

Covering your plants before a frost may save them
 

I covered my plants each evening that I heard the temps would be below 35 degrees. Almost all survived. The poinsettias didn't make it even after being covered.

Plants
 

The second one is gone. Time to stop all treatment. Sorry

Be careful. If you prune/cutback too soon it will promote new growth which is even more susceptible to a freeze and will kill the plant.

"newly planted" might be the key phrase here. Established plants - 1 or 2 full seasons - have a more established root system and will usually come back. I would wait and see if you get some new growth near the base of the plant before you give up. But this was unusually cold for here, and that will happen from time to time. Covering helps. Lantanas and pentas are not really considered "tender" plants here. After a few times losing plants, you will be more selective in future - I know I am, but still, if there's something I love, I will plant and cover when indicated.

Leave them for now and then trim back the dead parts med March. You’d be amazed at what grows back

My coreopsis (also known as tickweed) that were only planted a month ago suffered no damage and will bloom again in the late spring thru the summer.

Thanks .. the only part I disagree with is but this was unusually cold for here because we have been here 5 years and every year has had at least 1 "deep freeze" including the first week we moved in here in early January 2017. I was ready to demand a refund! :D

Cut an inch from ground after last frost and they will grow back!

Time To Get Rid of These plants?
 

Avoid the temptation to cut off dead growth on plants until about mid March when last frost warnings are over for our area. The dead growth actually protects the live parts of the plant from future frosts yet to come. Many pentas will actually com back after removing dead growth in mid March. Vinca is a colorful flower that will almost always come back after frosts, lantana comes back and hibiscus. Knockout roses will bloom all year even through frost and roses can be pruned mid Feb.

Agree...
:):)

WAIT! Don't cut them til March!
 

I am learning about our plants in this area (we are mostly all from elsewhere!) and asked a local landscaper if I should cut back the "dead" parts of my plants. The answer was "NO!". Wait til end of April or into March--whatever you cut now will be vulnerable to the next frost and it will probably kill it. What we think right now is "dead" may in fact not be totally gone!
:a040:

Not as cold as 3 years go when it got down to 26 in my area three nights in row. All my tropicals survived and came back bigger. But I covered them up and the was well establish and woodie. Young plants don’t have much of chance when it gets below freezing for several hours or days IMO.

Snap dragons also good.

Truly simple advice from an old neighbor from a different era and a different climate zone.
It isn't dead until it is dead. It may well come back in the spring. There is NO REASON to dig it out now. Dead material, you can always remove it later. Procrastination and sage advice often can be the same. Both save a lot of useless WORK..
SPRING FEVER can be dangerous for your plants.

Marginally hearty plants. You can IF you choose to baby them, PERHAPS, force them to survive. Will YOU always want to. remember to, be able to, baby them. ARE THEY WORTH THE TROUBLE????????

Beware of trips to the garden centers and big box stores. Even MONSTER plants look pretty grown under IDEAL conditions. READ before you buy. Plants from neighbors?
Also beware. Why do they have plants to give away? Often it is because they are taking over their yard.