Top 8 Most Profitable Specialty Plants to Grow in a Greenhouse

7. Spinach

As an ordinary green, spinach that’s up next on our list of top 8 most profitable specialty plants to grow in a greenhouse has shown to flourish when grown hydroponically. A research has shown that germination of hydroponic spinach is from 44%-25%, with germination period of around 10 days, and harvest time after around 40 days, with the yield of around 3.5 oz. With these calculations, it can be assumed that easily grown spinach is among the top most profitable specialty plants to grow in a greenhouse.

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