To hang hanging plants from the ceiling frame? I'm wasting valuable sunshine space up there!

Sure, any metal hook would work fine. That sure is a lot of money to pay for a simple metal hook though. You can purchase all sorts of metal (coils and rods) from a big box store and make your own.

I feel at about $4 for a large hook is a fair price. It is hard to find square-headed hooks! Have you seen them @ken? These were made for another GH brand, Riga. I will have to release the ceiling bolt to be able to slide it into the groove. I suppose that one at the very peak would be the bolt to loosen?

I found a pic of the Riga channeling on the ceiling. I think it might work on my
HF. I think it might just work, depending on the size of my channel. I think one more bit of research to copare channel sizes and I'm in on this!

I simply bend brass/copper/steel rods on both ends, making the length anything I want. I then can hook it over most any frame style. Perhaps this wouldn't work for you though.

I have tried standard hooks that fit into the channel. But it slides all the way down towards the bottom of the panel. I would like to have them in the best position for the sun and to save space in the greenhouse by using the empty 2 feet of space at the top of my GH. With hooks such as these that lock, I can have them hooked very near to the center beam which, btw, does not have a channel (see original pic)

Only if you have the GH reinforced. You don't want to be hanging a lot of weight on the frame if you haven't reinforced the frame.

I guess we are talking about another brand of GH. My frame will take anything I want to hang.

@drdawg Ken, Cheryl is asking about the Harbor Freight GH specifically.

Oh, sorry. My greenhouses are not HF.

I get the weight thing, @Melissa. There are only 5 in the set and dI will be sure to spread them around in different places on the frame. Mostly I am concerned that my 5 portulaca and (trimmed up) bougainvillea pots get high enough to get full sun during the winter. They are light weight plastic pots with all the perlite in the soil and I don't water them often. I do have some heavy hanging plants that will stay hung on the EMT pipes.

I've only had my HF for a half season, but judging from the numerous videos I have watched about them I would be hesitant to hang any weight on it.

Many of us put a EMT frame inside our HFGH, that's where I hang most of my baskets, I, as well as other also added support on the gable walls. If you go to The thread "Harbor Freight Greenhouse projects" in Greenhouses forum near the bottom of the page 5,you will see a post by HollyAnnS that shows it pretty well.
Here are 2 more sites that may help. The thread "Harbor Freight Greenhouse projects" in Greenhouses forum
http://hfgh10x12.blogspot.com/...

Thanks, @Eric. I did horizontal EMTs during the original build and plan to put up one more going from the doors to the back wall. That is where I currently hang many plants, too. However, that still leaves that 2 feet of unused space in the gabled (that's the word you taught me during my build btw) area. I would love to put that 2 feet of space to use. I don't get as cold as most places. That area gets the most sun of course. Most of my Tropicals need shade. I thought putting my hanging pots of portulaca, bougainvillea that need a lot of sun up there would also help shade the plants down below. I am being told here that the frame won't hold 5 hanging plants. I am thinking if I erect, EMTs vertically, the "snow supports" from floor to ceiling, even though I don't get snow, that would support` the roof? But do I want to lose floor space for 5 hanging plants?? I have a LOT Of hanging plants!

I know what EMT's are in the health business, but what is an EMT when it concerns greenhouses? I guess my greenhouses don't have any of those.

@Ken, in the Harbor Freight Building Blog, one way to reinforce the greenhouse is to use something called EMT. IDK what the letters stand for, but they are galvanized pipes. You can install them crosswise, longway, anyway to help support for the weight of snow on the roof, for wind, and other elements that might otherwise harm the greenhouse.

Electric Metal Tubing or metal conduit, is a lightweight galvanized pipe. Easy to bend with a pipe bender and very strong in respect to it's weight and cost.