First, you can't plant 400 trees if you are ignorant. It is understandable to say that the old lady is too old to know that she is growing poppies. After all, poppies are actually very beautiful, but the old lady planted 400 trees. If there is a plan, no one will believe it.
Can you plant 400 trees without knowing what it is? It is very likely that the old lady actually knows that it was planted on purpose, so she can plant 400 trees at a time. Later, her family told her that it was illegal, and she could only say that she didn't know.
After all, if you knowingly commit a crime, it will be much heavier than the current sentence, so the old lady insisted that she didn't know what it was and wanted to reduce her sentence.
Second, it is even more unrealistic to know that it is poppy after being caught. Nobody at home went to see the old lady? Obviously, the young people at home must know something and may have told the old lady about it, but the old lady didn't listen at all and went her own way. The family didn't talk, so she followed.
But when the old lady was caught, it was absolutely impossible to say that she knew. After all, in this case, the sentence will be heavier. If she says she doesn't know, the judge may think that the old lady is just ignorant, so she will give a lighter sentence. Finally, the old lady was sentenced to five years.
So judging from the number of plants, the old lady must know, or she wouldn't have planted more than 400 trees at once. It is even more unrealistic to say that she didn't know until she was caught. This only shows that she deliberately concealed it, and the purpose of doing so is obviously to prevent herself from being sentenced so heavily. After all, the penalty for knowingly committing a crime is much heavier than that for not knowing it.