If you have an outdoors, start planting in August, Cavolo Nero kale will last the winter even if you have a frost. Endive should be planted in late summer, it's another one that will withstand frost.
I planted Cavolo Nero kale (Nero de Toscana) last autumn, and I only pulled up the last plants a few weeks ago as they were going to seed.
If you can't do it outdoors, then do it indoors: sprouting carrot, kale, mustard, broccoli seeds will all do well in your indoor sprouter.
New Zealand spinach is a different plant altogether, quite luscious and leafy, but I found that even it suffered in the hot weather.
also, day length makes it bolt.. even if it's not so hot. Broccoli is way high in all kinds of vitamins, even higher in vitamin C than orange juice.
Someone else was asking about growing spinach indoor a week or so ago, and those posts should be viewable from the newsgroups on google's news link. It was in either this group or rec. gardens.
You can try growing spinach under grow lights, but you'd have to do some research on day length sensitivity or it would bolt indoors too if it gets too many hours of light. I don't know if stray light from other areas would be enough to "set it into bolt mode" or not. It's an awful lot of trouble to go to in order to grow spinach when other plants that are also nutritious or more sow without the oxalic acid problems of spinach blocking assimilation of other nutrients.
Malabar spinach, new zealand spinach, orach in red and green are just a few "hot weather alternatives" to spinach which would also provide the nutrients that are present in "green leafy vegetables" and lots of magnesium .. which a lot of folks are deficient in because they just don't eat enough green leafy veggies.
Dinosaur Kale I hear is supposed to be delicious. Mustard and collard greens. They're all better with a touch of frost, but still but are usable along the way until frost..so you could plant them in late summer for fall. In the mean time, there are oriental greens too, tatsoi, tsai-tai , mizuna, along with all the traditional garden greens.
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