true to type

These seeds will always grow "true to type," maintaining the same characteristics over time — "So your grandma's tomato is the same tomato her grandma had."

True to type means the fruit from the saved seeds — second generation, third generation and so on — will have the same characteristics as the original seed.

Seeds with this designation perform true to type through pollination.

Utah Sen. Mitt Romney, a Republican who has often crossed the president, said Trump was staying true to type.

Hillary never made any bones about being a high-functioning political alpha and there she was – staying true to type.