Gardening in a greenhouse on the coast
Thanks for your questions, "what greenhouse will withstand the wind on the coast?" and "will a greenhouse allow me to grow tomatoes?"
I will begin by telling you my personal experience with greenhouses. I live 3 miles off the coast in south Lincoln county and have grown a wide variety of vegetables in greenhouses on my property for 28 years! Initially I built a PVC hoop and plastic green house which stood for several years but did require replacing the plastic as it eventually became brittle. About 22 years ago I obtained a glass/aluminum green house 30' X 15" which my husband erected. It stands on a 3 foot concrete stem wall. Brand name is 'Lord and Burnam.' Unheated, it has several pulley operated roof vents and numerous grated floor vents, a sand/ gravel floor, iron/wire tables and 4 greenhouse fans. Air circulation is extremely important! It has withstood winds of ><85 miles/hour! I grow tomatoes, peppers, basil and hundreds of seedlings annually (many have been grown for the master gardener annual plant sale). All of the vegetables which are later transplanted outdoors begin in the greenhouse.