In Harleysville, Brian Haentze and Jamie Romani have converted an old chicken house on Haentze’s family farm into a skylighted, 4,000-square-foot, aquaponic greenhouse. This year, their first full season, they expect their Evergreen Lane Farm to produce thousands of heads of lettuce, strawberries, and microgreens for their client, the Desmond Hotel in Malvern. And they’re marketing aquaponics kits, which can produce vegetables as well as fish, to schools and home growers. (An on-site hatchery sells fingerling tilapia, which grow to full size and can be eaten.)

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