Hello all. I live at 8,600' in Colorado. While I've always been a gardener, I've really got my hands full trying to raise traditional vegetables at this altitude. I recently completed a greenhouse and am having some disappointment in getting things started. Just looking for some help with various things. Currently, I have tomatoes, corn, string beans, spinach, brocolli, carrots, bell peppers, lettuce, and canalopes planted. The only things doing reasonbly well are the tomatoes and corn. Everything else is either stunted or wilting and dying. That's one problem. I also have set up a simple hydroponic system. I'm using Grodan cubes and clay pellets. I'm having trouble getting seeds to start in the Grodan cubes in a separate tray. I've planted about two dozen seeds and have germinated about 8 plants total since the first of October.
Finally, my greenhouse has a power thermostat control roof vent and I have two vents at the bottom sides of the greenhouse along with a storm door that can be vented. This time of year, the outside temps have been as low as 0 and typically up in the 40-50's during the day. My inside temps have been in the high 30's and up to about 90 with the vent fan running.
I water every other day and recently, I've started using a little Miracle Grow mixed in the water. It's doesn't seem to be helping. Also, I want to be 100% organic so suggestions would be helpful
I am looking for help in understanding why the plants just don't seem to be growing/thriving. It seems it takes about 3 weeks to germinate seeds in the dirt pots, and then they just don't grow.