You can transplant twice (once to 2 inch than once to 4 inch) with no problem. Do NOT use a mixture of garden soil and humus! In most cases this mix will be too dense and retain too much moisture. Use the potting mix or purchase a good soiless mix like Pro-mix. Jon

I have an attached GH on the S side of my garage which I use for tomatoes and pepper plants. It is passive solar (with the occasional electric heater on very cold, I am currently growing the same tomato and pepper plants I had in there during the summer. Two tomato plants (grafted cobra derivative, and an orange paste tomato self rooted) are still growing, flowering and ripening tomatoes, although much more slowly than in the summer. I do prune the plants back 50-75% around T'giving, and they regrow just fine. Just harvested a pound or two of tomatoes this week. Made a big batch of sauce 5 weeks ago (last sizable harvest from them). The average daytime temps are 70-80F on sunny days, and it gets down to 38-45F at night. Biggest problem is lower levels of light this time of year. I suspect yields would be far higher if I supplemented light. I would think that in MD, you have about the same amount of daylight I do (I am at 40deg latitude), and your GH temps are similar. So you should be able to continue existing summer plants on through the winter and get some fruit as I do. But as Cole Robbie has said, starting new plants now probably is not going to do much until the light levels and heat increase. I generally don't bother starting any new plants until the end of Jan due to light levels.

Schumacher Seeds. When ordering in January, you will usually get fresh seed which has a great germination rate. I stratify in moist vermiculite in the fridge for 30-60 days...they'll almost all germinate in the fridge so be prepared to pull them out and plant them when that happens. Seedlings (like most conifer seedlings) are intolerant of wet soil....be sure that you are using a well draining mix. With regular feeding until early July, they got to 7" in their first summer. Finally, I've found them to be very deep rooted and after trial & error, Stuewe Deepot D40L worked best for me for the 1st year. Before 2nd year growth starts, pot them up. With time release fertilizer you can get them up to 15-18" tall in year 2. I potted mine up to 3 gallon containers (RootTrapper bags).

joeywyomingzone4 I appreciate the info. gave. You wrote: "The vegetable garden has been a bit of a disaster. The Kellogg's Organic Raised Bed soil that I bought to fill my planter boxes turned out to have an excessively high salt content and killed the seedlings I raised, along with the replacement plants I purchased from the nursery. It even killed bindweed that tried to grow up the side of the planters and root in the dirt! So, I thought I'd let you know that the Kellogg's brand of soil has been really toxic for me." Joey. garden nest 101 Z5 northeast: ALERT about Better Homes and Garden bagged soil for container (black bag) sold at Walmart: It's also high in salt and made by rootings broke out in mildew. It has turkey manure, too salty. The other rootings, planted in BEYOND PEAT potting soil (purple bag at Walmart) DO NOT HAVE MILDEW. BEYOND PEAT is the purple bag on sale this fall for $2, versus $5 for Better Homes and Garden container soil. So the cheaper price is actually better quality. Scott's bagged topsoil (red bag) sold at Walmart also changes the formula to be higher salt. Back in 2012 I was foolish to mixed horse manure into my clay, then planted 3 Austin own-roots. They broke out in salt burn (brownish at the edge of leaves). In 2012 I replaced the soil with Scott's bagged topsoil, and each Austin gave 40+ blooms as 1st-year own-root & very healthy. Back then that soil had lots of black peat (decomposed peat), thus high in nitrogen. Fast forward to 2022, I bought Scott's bagged topsoil, and the ingredients changed to LESS expensive black peat & MORE cheap & salty horse manure. I found a wad of brownish horse manure inside. It's saltier, and made my roses broke out in mildew, plus brownish burn at edge of leaves. Will scrape off that soil which I used to top my air-pots.