"Physical Description
Species Malus baccata
Trees to 10-14 m tall, with arching or pendulous branches. Branchlets reddish brown, terete , glabrous ; buds reddish brown, ovoid , scales tomentose at margin . Stipules caducous , lanceolate, ca. 3 mm, membranous, margin entire or with sparse glandular teeth, apex acuminate; petiole 2-5 cm, puberulous , with few glands when young, glabrescent ; leaf blade elliptic or ovate , 3-8 × 2-3.5 cm, glabrous or slightly puberulous when young, base cuneate or rounded , margin serrate, apex acuminate, rarely caudate-acuminate. Corymb at apices of branchlets, umbel-like, 5-7 cm in diam., 4-6-flowered; bracts caducous, linear-lanceolate, membranous, glabrous, margin glandular denticulate , apex acuminate. Pedicel 1.5-4 cm, slender, glabrous. Flowers 3-3.5 cm in diam. Hypanthium campanulate , glabrous. Sepals lanceolate, 5-7 mm, longer than hypanthium, abaxially glabrous, adaxially tomentose, margin entire, apex long acuminate. Petals white, obovate , 2-2.5 cm, base shortly clawed, apex obtuse-rounded. Stamens 15-20, unequal, ca. 1/2 as long as petals. Ovary 5- or 4-loculed, with 2 ovules per locule; styles 5 or 4, longer than stamens, densely villous basally. Pome red or yellow, subglobose, 8-10 mm in diam., with an obscure scar at apex; fruiting pedicel 3-4 cm, glabrous; sepals caducous. Fl. Apr-Jun, fr. Sep-O [source]
Habit: Tree , Shrub
Flowers: Profuse, small flowers borne in corymbs, with five petals. Blooms in April to early May. Fragrant, 5-petaled blossoms . Attracts
bees. • Bloom Period: Mixed forests on slopes , among shrubs in valleys; sea level to 1500 m. • Flower Color: near white, white
Seeds: Fruit: Globose pome containing 5 carpels arranged in a star, each with 1-2 seeds.
Foliage: Summer foliage: Leaves are smooth , simple , broad, ovate or broad-eliptic or lanceolate, unlobed and toothed along the margin . Color is medium green.
Size/Age/Growth
Size: 20-30' tall.
Landscaping
Landscape Uses: Patio tree . Small groupings or massing. Specimen. Useful for showy bloom . Useful for high quality summer foliage . Attract birds and wildlife to fruit. • Care:
Deer resistant. Tolerates pollution . Tolerates
rabbits.
Requires cross-pollination between individuals, via insects.
Established plants can benefit from fertilization."
Above quote is from :
http://zipcodezoo.com/Plants/M/Malus_baccata/ (Sorry i was going to shorten the quote, but i don't know how much of the info would be useful to you.)
-------------------------
It wasn't easy to find reproduction of crab apples. It says that the Siberian Crab apple has white flowers, but elsewhere says that some people group other crab apples under the Siberian name..
I underlined the reason that you are not getting fertile seeds...so, if you don't want to buy a second tree or buy rooting hormone and try to root cuttings, then
the answer to getting a fertile seed would be to use a paint brush to obtain pollen from one crab apple tree and put the brush in a plastic bag and take it to another crab apple tree and hand pollinate a flower. (Mark the flowers you pollinate well or you will not know which fruit is fertile and which sterile.)
Crab Apple is highly prized for smoking and curing meats. Try some of the
wood in the BBQ grill and you may never use other woods for smoking again.