どのくらい大きくなるの？って英語でなんて言うの？

"How big will it grow," referring to the plant, is a common way to ask how large it is expected to be once fully grown. "How large will the plant be?" is similar in what it's asking, but using the word "large" here implies that it will be a bigger plant. If it tends to be a smaller plant, or whether the size is completely unknown, the first question is more common.

When asking someone how big a plant can get you can ask "How big will it get?" or you could also say "How tall will it grow?" Both of these ask the person to tell you how big the plant will get.

examples "how big will it grow?". or "how big is it when fully grown?". or "how large will it be?". or "how large will it get?".

Examples: How large does it grow? What is the biggest it gets? These are some great ways of asking about how big the plant will ultimately grow by the time it finishes growing. These questions are direct and to the point in reference to the plant. Also, it will get you the answer you are looking for in regard to the approximate size you need or want.

Explanation:- The first question is an open question and more likely to get a detailed response.The second question is a closed question likely to obtain a yes or no response Example sentence:- A. "Does that plant grow very big?" B. "No, just a few inches."

Many different ways to ask this question. Mostly asking for an estimate on maximum size. How big,how large all depend on how much care and attention are given to plant. As does "will it grow as big as". Only difference here is you are more able to visualize its size as you can compare to something you already know or can see

Large and tall are words that describe something big so you can substitute any of these words in the context of this plant. Asking 'how large/tall/big will this plant be when fully grown' is the most thorough way of asking this question as it specifies that you want to know the largest it will ever get.