I definitely believe you have the skills and talents to win over your husband with this amazing idea!
Go with the greenhouse as a starter, and show him (by your success) how valuable your skills can be to your family - grow your family's favorite foods, cook with it, snack with it, show him how fulfilling it can be to grow something out of nothing, how beautiful plants can be. teach your child(ren) to love getting dirty, love to help water the plants, pick the veggies right of the vine; show him the poetry and romance of farming before you even step one foot off your property.
Help him to fall in love with gardening, as you do; now you have a passionate partner in your venture, and a much happier, fulfilling future than ever before.
How do you think I got my farm future to become reality?