Here is the sad update. My little test plant (which I now know I planted too soon) bent it's two little leaves to the ground and never recovered. So the rest, in the egg carton kept growing. I waited for 2 sets of leaves to appear, and THEN I put them in the ground. They now have more leaves and are obviously happy and growing. Except... There were two late "hatchers", and I let them wait. But outside. I wanted to acclimate them to the night air. HUGE mistake! I am a triple murderer now!! Those two egg shell babies, nestled in the egg carton were sitting on the edge of the jacuzzi, where there is sun in the day! Last night as I slept, a big wind came up... I woke up thinking I would go give them a drink, and they were no place to be found... Until I glanced in the jacuzzi! OMG!! The shells were broken, the egg carton was floating upside down, and I murdered two precious little seedlings!! Lesson learned!!

Both these plants are hardy annuals, which means it will take a hard frost to kill them. The packs may give you those months but it depends where you live and no seed provider can cover all growing conditions. Planting in zone 9 or 10 will be at a different time than it will be in your zone and it will be much later in my zone 3. You plant these plants as soon as the ground can be worked. Sweet peas in particular, like regular peas like to germinate in cool, amended soil. A few degrees of frost will not kill either one, but planting too late when the soil is hot may cut down on germination. You can also plant Larkspur outside in the fall, but early enough that it grows a small plant before freeze up. If your last frost date is April 15th you could plant outside sometime around the first part of March. I don't know what your climate is like or how it warms in spring, so this is just a guess based on how it is here.

sweet peas are some of the earliest seeds you can plant. "as soon as the ground can be worked" which was a while ago.

Here in zone 9 Texas, I plant sweet pea in the fall, usually October, but just got them planted last week. Jim.