I like this idea (and the net cups) I just don’t know if I have the space.
(For context most of my gardening space is a couple rolling boxes each about the size of those totes.)
Space is also a consideration for me. I set up my seed starting shelf in our second bathroom, and that's all the space I really have. The Hefty Hi Rise 72 quart clear totes are nice because when it comes time to move them outdoors during the daytime, I can restack the totes inside the house in the evening and they don't take up much room stacked vertically.
My goal is to someday have a nice outdoors greenhouse. Until then, I will do the best I can with the space I have. The 3-inch net cups take up more room than those square plastic seed starting packs made for the 10X20 trays. But it's a good tradeoff for me because I don't have to up pot my peppers, tomatoes, etc...
Rootbound? What were you planting? I had the opposite issue, I took too long to plant them last year and the rolls disintegrated and they started to grow into each other.
I was planting peppers and tomatoes. The toilet paper rolls are good for starting the seed, but those plants quickly outgrew the size of the toilet paper pots. Well, that and I had a problem with mold. I lost just about everything I tried to start in the paper roll pots. I admit, a more experienced gardener might have had much better results.
I am all for upcycling products and not wasting free materials. I really wanted the toilet paper rolls to work for me. But I did not have much success. Now, I just take those toilet paper rolls and shred them in my paper shredder and use the shreds as deep bedding litter for the chicken coop and then later they get composted. So, I just found a better way to use those paper rolls for my uses.
My toilet paper rolls did not disintegrate. They just got moldy.
I added a couple splashes of hydrogen peroxide to the water to help with that. (And, admittedly, this is why I’m spending money on potting soil this year. I used top soil I had on hand last time and got mold and also fungus gnats EVERYWHERE, but I’m pretty sure that was the dirt and not the TP rolls.)
That will probably help. Good potting soil will drain better. But I thought my problem was mainly that I overwatered the toilet paper roll pots, and they just would not dry out fast enough to prevent that mold from growing. In comparison, the plastic net cups with slits in them are much easier for me to bottom water, they air out better, and I did not have any mold last year.
No doubt I messed up using the toilet paper roll pots and overwatered them. I'm just saying that the net cups worked better for me. I hope you come back and let us know if you were successful with your paper roll pots and what lessons you learned from using them - such as watering, how long you kept the plants in those pots, and if the hydrogen peroxide and better-quality potting soil prevented the mold issue that some of us had with paper roll pots.