Jubal is unable to grow a turnip larger than 5 cm in diameter. He has tried all his life to grow one bigger, like the one in "The giant turnip" but has never been able to.
He once entered his largest effort (4.6 cm) in a famous local vegetable competition. It was particularly notable for featuring the fiercely fought "Titans of turnip" cup. He hoped he might catch a quiet year and win, but was humiliated to be instead awarded a rosette for growing the smallest turnip.