No, I don't think dried seed will germinate quite that easily for you - Fall sowing fresh seed may have resulted in easy seedlings this Spring. Clothiers: Acer palmatum , Japanese maple, seed should be collected from the tree before it dries, then sown directly outdoors for germ. the following spring. To try to mimic what mother nature would have done with these in Fall, try pouring hot water over the seeds, let stand in the water for 24-48 hours. Drain water from seed, put them in a zip lock with a little moist sterile sand or vermiculite at room temperature for 60 days, then cold stratify for not less than 60 days and up to 120 days before bringing them back to warm.

Given your location, it seems the maple should do quite well but the plumeria will need to be brought in for winter :-) There is often a lot of misinformation about the correct naming of Japanese maples. All named forms - cultivars - of Japanese maples are propagated asexually, either by grafting (most common) or by cuttings (less common). All seed grown Japanese maples are just referred to as generic Acer palmatum - no cultivar name - regardless of what the parent plant was. Cultivar names are registered and all reputable growers will propagate correctly with the approved and correctly labeled stock plants. But there are many less reputable sources that will produce maples under other, non-registered names or even by seed. 'Bloodgood is perhaps the most widely propagated Japanese maple on the market and you will often find seed-grown so-called Bloodgoods on the market. They may very well look like Bloodgood but they are not. You may find "dwarf" Bloodgoods included in this somewhat suspicious grouping. Bloodgood is a pretty good sized JM. The typical mature size is often quoted as 20'x20' but Vertrees (THE JM authority) reports a mature height of upto 30 feet. As I stated previously, there is NO dwarf Bloodgood but a good number of smaller growing Bloodgood look-alikes, several of which were sports or brooms from a known Bloodgood. But they are known by different names if properly registered cultivars. Enjoy whatever tree you actually have :-)) I've yet to meet any Japanese maple I didn't like!

Maybe yes, maybe no :-)) Seedling Japanese maples can often show a great deal of variability from the parent tree in terms of habit, leaf color and leaf size. That's why you cannot get named forms (cultivars) from seed. However, a good many times seedlings will resemble the parent tree quite closely. All you can do is wait and see. FWIW, virtually all commercially grown JM's are grafted and the location of the graft (combined with typical habit) is what determines ultimate height. If yours is a weeping form, chances are it will stay relatively short.

Sunnytop, ALL dwarf, red maples are suitable for container growing! Lots of features to choose from, such as leaf shape, growing habits etc. Good Luck AL