I have not posted this on my website, but it certainly is intriguing:

A potential substitute for Apple trees is a plant called Sea Buckthorn:
"Managed specifically for commercial production, Sea buckthorn provides an excellent opportunity in establishing a value-added crop on marginal lands. These shrubs will produce high yields of tightly clustered berries, and can be productive for up to thirty years or more. Growing the trees organically is highly encouraged."

"A 6-10% male:female ratio is recommended throughout the plot. As pollination is achieved strictly by wind, their distribution is important in order to achieve optimum effect.

•Total shrub density per acre is about 700.
•1-3m between plants in each row
•2-4m between rows

"Sea buckthorn grows two to four metres tall over a four-to-five-year period, then it begins to bear fruit. It reaches peak production in the seventh to eighth year and remains productive for thirty years with proper pruning. Leaves can be picked starting on the second year. Flower buds will first appear on three year old wood."

"Sea buckthorn provides the perfect opportunity to make use of your idle land or to introduce an alternative crop to your orchard. Profits are estimated to be $10,000 per acre (approximately ten times that of apples)."

.......
Sea Buckthorn takes 4 years to grow before producing fruit. It also requires a ceiling at least 4 meters tall (13 feet) with clearance if overhead artificial lights are used. This may add 15 centimeters (6 inches) or more to the ceiling height. Crop yields are about 4-5 metric tonnes per acre, versus just 2 tonnes for apple orchards. Although better than apples, would still not be suitable for a mission to mars because they take so long to grow. Ultimately astronauts may have only dried fruit and vitamin tablets to go on. As such resupply missions may be absolutely essential in the future, no matter what we do.