Plants are commonly irrigated with hard water or saline/reclaimed water in many agricultural and landscape contexts, making the statement trivially true through everyday observation and agronomic practice. No specific citation is strictly required to prove that plants survive when watered with hard water, though multiple studies document plant growth under mineral-rich or saline irrigation regimes.
The claim that plants can survive when watered with hard water is a matter of everyday observation and basic agricultural science (hard water contains calcium and magnesium, which plants actually require as nutrients, though very high hardness/salinity can cause stress). Under Step 0 and the prompt instructions, trivially true statements by direct everyday observation are classified as COMMON_KNOWLEDGE. Several retrieved papers discuss plant survival and growth under challenging irrigation conditions such as saline or reclaimed water containing elevated mineral contents (e.g., papers 2, 3, 6, and 7), which supports the broader notion that mineral-laden water does not outright prevent plant survival. Therefore, the verdict is COMMON_KNOWLEDGE, with supportive papers included.