This is a tough one. We are inclined to think that sweet peas鈥 needs are so particular that keeping them indoors for the entire growing period would not give you the results you want. (See specifics above.) You could transplant some in, say, mid-August and some later (and maybe not transplant a few to see how they go indoors). Per above, if you can keep their 鈥渇eet鈥 cool, you might have success in August. Keep in mind, too that sweet peas like sun, and the days are (already!) getting shorter. We suggest getting the seeds out when you can to give them plants the best chance to mature.
We also suggest that you contact your local cooperative extension service (find your state here and click through: http://www.almanac.com/plant/sweet-peas). They are local experts and may even have experience with your situation.
This is a tough one. We are inclined to think that sweet peas鈥 needs are so particular that keeping them indoors for the entire growing period would not give you the results you want. (See specifics above.) You could transplant some in, say, mid-August and some later (and maybe not transplant a few to see how they go indoors). Per above, if you can keep their 鈥渇eet鈥 cool, you might have success in August. Keep in mind, too that sweet peas like sun, and the days are (already!) getting shorter. We suggest getting the seeds out when you can to give them plants the best chance to mature.
We also suggest that you contact your local cooperative extension service (find your state here and click through: http://www.almanac.com/plant/sweet-peas). They are local experts and may even have experience with your situation.