pea shoots actually keep almost indefinitely if you can keep them cool and in plastic bags- i sell them out of a cooler at the market.
as far as the cost of growing them goes:
i plant 25 or so trays a week, using maybe 2 cubic feet of soilless mix and maybe 3.5 pounds of seed (trying to overestimate here)
cost:
soilless mix @$10
seed@ $5
yield is generally between 5 and 6 pounds. i get $7/half pound for the pea shoots for a conservative gross of $70.
growing time is 10-14 days depending on season. greenhouse heat is an additional cost in the winter time. labor is about 1 minute per tray to plant and the same to cut. watering takes maybe 20 minutes a day for 500 trays or so of all the micros i grow.
imo pea shoots are possibly the most cost effective item i grow. they are far and away the most hassle free micro i grow.
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