|10-20cm high, naked roots||7.00$ +1|
Quercus alba typically reaches heights of 24 to 30 m (80–100 ft) at maturity, and its canopy can become quite massive as its lower branches are apt to extend far out laterally, parallel to the ground. Trees growing in a forest will become much taller than ones in an open area which develop to be short and massive. The Mingo Oak was the tallest known white oak at 44.2 m (145 ft) before it was felled in 1938. It is not unusual for a white oak tree to be as wide as it is tall, but specimens growing at high altitudes may only become small shrubs.
White oak may live 200 to 300 years, with some even older specimens known. The Wye Oak in Wye Mills, Maryland was estimated to be over 450 years old when it finally fell in a thunderstorm in 2002.
Another noted white oak was the Great White Oak in Basking Ridge, New Jersey, estimated to have been over 600 years old when it died in 2016. The tree measured 8 m (25 ft) in circumference at the base and 5 m (16 ft) in circumference 1.2 m (4 ft) above the ground. The tree was 23 m (75 ft) tall, and its branches spread over 38 m (125 ft) from tip to tip. The oak, claimed to be the oldest in the United States, began showing signs of poor health in the mid-2010s. The tree was taken down in 2017.
Sexual maturity begins at around 20 years, but the tree does not produce large crops of acorns until its 50th year and the amount varies from year to year. Acorns deteriorate quickly after ripening, the germination rate being only 10% for six-month-old seeds. As the acorns are prime food for insects and other animals, all may be consumed in years of small crops, leaving none that would become new trees.
The bark is a light ash-gray and peels somewhat from the top, bottom and/or sides.
In spring, young leaves are delicate, silvery pink, and covered with a soft blanket-like down. The petioles are short, and the clustered leaves close to the ends of the shoots are pale green and downy, resulting in the entire tree having a misty, frosty look. This condition continues for several days, passing through the opalescent changes of soft pink, silvery white, and finally, yellow green.
The leaves grow to be 12.5 to 21.5 cm (5–8+1⁄2 in) long and 7 to 11.5 cm (2+3⁄4–4+1⁄2 in) wide and have a deep glossy green upper surface. They usually turn red or brown in autumn, but depending on climate, site, and individual tree genetics, some trees are nearly always red, or even purple in autumn. Some dead leaves may remain on the tree throughout winter until very early spring. The lobes can be shallow, extending less than halfway to the midrib, or deep and somewhat branching.
The acorns are usually sessile, and grow to 15 to 25 mm (1⁄2–1 in) in length, falling in early October.
Quercus alba is sometimes confused with the swamp white oak, a closely related species, and the bur oak. The white oak hybridizes freely with the bur oak, the post oak, and the chestnut oak.