You can build an affordable greenhouse in your backyard. Or maybe a more elaborate Conservatory or an attached greenhouse that can double as a solar collector.
Ideas on How to Build an Affordable Hobby Greenhouse:
M. D. Boyette, T.E. Bilderback. A Small Backyard Greenhouse for the Home Gardener, AG-426 North Carolina Cooperative Extension Service
Read more at: https://gardening.ces.ncsu.edu/publications-3-2/
John W. Worley. Hobby Greenhouses, UGA publication 910. https://extension.uga.edu/publications/detail.html?number=B910&title=Hobby%20Greenhouses