So I have this mini greenhouse in my room, I live in the city in the apartment, so I can't really grow anything. The mini greenhouse can grow marigold, using artificial soil, the size of the greenhouse is 9 x 6.5 x 6.5-inches. What other nice beautiful flowering plants can I grow in there?

I'm wanting to use a mini-greenhouse this coming spring to get a head start on the growing season. Do I have to start the seedlings indoors, or can I start them in the greenhouse outside. If so, do I have to wait until after the last frost to put them outside? If not, when do I start them indoors? If indoors is the proper way, what type of lighting is required? Thank you for your response.

Size of mini-Greenhouse is 11" x 21" x 2'T (approx). These are the seed trays with the plastic dome to gove over top to start seeds. The one I have has 72 "holes" or "spots" to start the seeds in. I bought these at Lowes. I believe the individual "holes" measure 1.25" x 1.25" x 1.25"

can anyone advise me on what these white spots (they look like a type of mould) are and how to treat them. there are. several types of plants, vegitables and flowers in the new plasic mini-greenhouse. although it looks like a mould it cant be rubbed of the leaves with my fingers and does not show on the undersides of the leaves. can anyone advise me on how to treat it ?.