I've never heard the term "seedling".
hehe...as with quite a few terms in botany, this one's got a lot of definitions.
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a young tree grown from seed, from germination to the sapling stage.
A young plant grown from seed.
plant of seed origin resulting from the fusion of an egg and sperm (pollen).
A young, recently germinated plant that has a single unbranched stem.
An unbloomed young orchid.
the next growth phase of the leaves after the cotyledons but before the juvenile leaves
A tree grown from seed that has not yet reached a height of 0.9 m (3 ft) or exceeded 5.1 cm (2 in) in dbh, which would qualify it as a sapling.
A baby plant. In forestry the term usually used to refer to young trees that have grown beyond the stage where they have just emerged from the soil up to the point that they become saplings. See sapling.
A tree, usually less than 2 inches diameter at breast height, that has grown from a seed rather than from a sprout.
Young tree grown from seed, from the time of germination until it reaches sapling size.
In nursery practices, a young tree that has not been transplanted.
a young tree less than 2 inches DBH or shorter than 4.5 feet.
A tree less than 1.35 meters tall. See the trees topic for more.
a young tree grown from the seed up to the sapling stage, that is a height of 4 1/2 to 6 feet (1.5 to 2 meters)
A tree, usually less than 2 inches in DBH, which has grown from a seed (in contrast to a sprout).
A nursery grown tree which has not been lifted and replanted in the nursery (see transplant).
the term for a plant that has just emerged from its seed with its first root, stem and leaves.
a young plant that has just germinated
young plant or tree grown from a seed
A seedling is a young plant sporophyte developing out of a plant embryo from a seed. Seedling development starts with germination of the seed. A typical young seedling consists of three main parts: the radicle (embryonic root), the hypocotyl (embryonic shoot), and the cotyledons (seed leaves). ...
Seedling most commonly refers to: *Seedling, young plants after germination from seeds (sometimes also referred to as sprouts)