I've failed repeatedly growing impatiens from seed in my UK greenhouse (SE facing, partly shaded). Tried light/dark, covered/uncovered, pressed/not pressed. Packet instructions fail. Tips or substitute plants for colorful displays?
Media: Sterile soilless mix (perlite, vermiculite, inert ingredients)—critical to prevent damping off. Sowing: Surface sow, dust lightly with mix—don't press in (compaction prevents germination). Light: Need light to germinate. Heat: 75°F+ (germination heater under flats). Takes 14-21 days. Humidity: Cover with plastic dome until 1/3 germinate, then remove for air circulation. Substitutes: Begonias, coleus, torenia, browallia for shade color.
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