I ve got a greenhouse up and running but not really sure how to manage it. Learning alot by my own mistakes - drowning seedlings, watering in full sun etc etc. When do I open door for air to get in? My potatoes are thriving, now got them outside and water twice a day, when sun's left the garden and early morning. Cherry tomatoes are doing well. Lettuce, meant to be easy but 2 plants out of 40 are thriving, rest are a disaster. Flower seeds are a disaster too. Any advice appreciated. Wanted to grow flowers for my own hanging baskets but it's not looking very good at all. Thank you in advance for any advice.