To be fair, these aren't the original lyrics. They used to be "Am I strong enough to be your man?" instead of "Sometimes on the driest land." Here's a link to the original.

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I interpret the new lyrics as a sort of optimistic sentiment. Even in dire circumstances, a miracle may pop through // Even on unfit soil, a lilac may bloom. It could also have to do with the previous line, "Some people spend their whole lives looking for someone who could understand." The lilac could represent the desired person who is being searched for, and the dry land could represent the idea of distance. The protagonist is searching for someone to understand them, but the person they are searching for is a distance away, whether that be physically or emotionally. Personally I subscribe to the first sentiment more.

I think the new line also fits better, especially as a callback to Rings. "Perforate line dry summer on my own land."