Since I have an avocado orchard I thought I’d jump in with a suggestion or two…
@ lilakess, do this first before you put the toothpicks in the avocado. At the bottom of the seed (the roundest part) Take a sharp knife such as a paring knife and carefully peel off the dark skin (this will help in producing a stronger root alot quicker. Do this under running water. I have never put my seedlings in the closet. Mine were started in the kitchen bay windows.
I have twelve trees at various stages of growth, The shortest being 10 inches and the tallest perhaps 15ft. I have given many away once they get to about 5 ft in height. I have 1 that is bearing fruit. And this will be it’s third time. And boy it has hundreds and hundreds of baby avocados.
I have a neighbor who lives directly behind me but down the hill, anyway he too has an avocado tree, that bears fruit as well. But, I digress. All my avocados trees are put in clay pots once they reach approx. 15inches and as they grow so do the pots. Some will be put in a 3’x3’x3’ square wooden container.
Oh! I also keep a log of when and what type of avocado type ie: Haas: sm, med, or lg fruit and date it was replanted. Okay , I said I would jump in with a suggestion or two, not write a novel, sorry I got carried away. Good luck!