Many annuals that can be germinated by wintersowing, can be given the same treatment, but just call it "spring" sowing. (Or if procrastination further delays this kind of sowing, you can just sow baggies of moist sand or small pots and do the same with the freezer/refrigerator.) Some, like cleome and sweet alyssum germinate fine wintersown any time between winter solstice and spring equinox, while zinnias germinate/survive better if sown closer to the spring equinox.
I'll come back and answer at greater depth, but for now of the top of my pointy head, the following have flowered into or beyond summer with winter and/or spring sowing for me:
Ageratum
Anchusa capensis
Antirrhinum (Snapdragon) (This might sulk thru Md. summers, but makes quite a show in Fall. Sow now so you'll have mature plants to flower once fall temps come. Antirrhinum majus sometimes overwinters in z7 Maryland.)
Browallia
Cleome (germinates best w/oscillating winter temps - I might try in/out from freezer/frig)
Cosmos blooms quickly from seed, but might do best sown w/warm temps
Delphinium/Larkspur (low viability so sow now or toss, best germ/growth w/cool temps. Flowering stops with summer temps, but what a show around here. Years ago on our hillside, larkspur self-sowed every year and gave a wave of blue followed waves of yellow coreopsis - great if you have no funds with which to garden)
Ipomoea purpurea (doubles (aka hige) like Sunrise Serenade look like mini-roses. Usually not I. nil)
Linaria maroccana
Malva sp. (probably best treated as biennial in Maryland - I got germination but the pot of seedlings was stolen. Anyhoo, if we don't know if it'll flower sown this late, worth a try.)
Pentas (mentioned because it has self-sown late, but too late for much flowering)
Poppies (including Papaver, Eschscholzia, Argemone; great spring show, but following with heat lovers)
Portulaca
Lobularia maritima (Sweet Alyssum)
Salvia coccinea (Some sages hardy to z8 flower all summer and worth wintering over in pots - dormant. For example, Salvia coerulea (syn S. guaranitica) have tuberous roots like dahlias and flower all summer.)
Verbena bonariensis - grow as annual w/early sowing, but often self-sows and/or returns from roots
Zinnia - renowned for ability to flower generously from late sowing up until July 1 here in Maryland. warm temps probably best, but has been known to germinate when wintersown around here.
Hope this helps. I'll try to post in greater depth this evening. For a list of woodchuck etck resistant flowers, I've published a blog with that list (crediting U of Penn as source)
karen
The above is from my own experience before 2014, when vandalism became too destructive for my erstwhile garden. For the record, many folks in Oella don't see any problem - there certainly are many different ways to maintain a property and garden.
