Articles are words that go with nouns to help identify them. They must always agree with the gender and number of the noun – plural or singular, feminine or masculine. We use Indefinite articles to talk about things in general or an object we don’t know or cannot identify.
If the environment is particularly dry, this could stunt the growth of the plant. However, if the genetics of the plant make it so that it does not need as much water to grow, it can still grow as tall as other plants.