My screens are either too big or too small. What are the best size screens to get and where to get them from
We don't make any product recommendations; we only offer advice on growing vegetables and ornamentals. You can call your local Extension Service, though, as they can offer more advice on this subject. The article below discusses using several different sizes of sieves to remove the chaff or using the ramp method.
https://www.gardeningknowhow.com/edible/grains/amaranth/harvesting-amaranth-plants.htm
I collected seeds from another garden and I'm not sure if it will reseed itself naturally.
It should if your season is long enough that the flowers produce seeds. Here is more:
https://www.gardeningknowhow.com/ornamental/flowers/globe-amaranth/growing-globe-amaranth.htm
My Baker Creek Seeds Elena's Rojo Amaranth has exploded. What looked like a sad raised bed is now a forest with up to 2" stalks. We should get a frost tomorrow <30 degrees. If I understand correctly, 3-5 after the frost is the hang in the garage and gently shake time. Am I correct?
You can harvest before a frost. Cover the flowerheads with a paper bag and hold the end closed tightly. Shake the seeds loose. Alternately, you can lay the flower heads in a plastic container, close the lid, and shake the container to free the seeds.
It gets full sun, is in a pot 12” wide and 14 inches tall. About 10 other stems are also in the pot. The leaf edges remained red, just the center turned green. Now new leaves coming in on those plants are fully red. I water and fertilize. Thanks!
It could be weather related, or too much fertilizer. These plants do best in poor soil. Since the new growth is coming in red, I wouldn't be too worried. Could it have been the tricolor variety? If it grew from seed, sometimes the seed is not as labeled.
https://www.gardeningknowhow.com/ornamental/flowers/love-lies-bleeding/love-lies-bleeding-flower.htm