Your beet roots stay small most often because too many plants crowd the same patch of soil and fight for space. This small beets problem trips up new gardeners more than any other issue with this crop. Fixing the spacing problem alone can double your root size at harvest time.
I struggled with tiny beets for two whole seasons before I figured out what I was doing wrong in my garden. My rows looked great with thick green leaves but the roots never got bigger than golf balls no matter how long I waited. Turns out I was skipping the most important step in the whole growing process.
Each beet seed you plant is not a single seed at all like most other garden crops. The rough brown ball holds a cluster of 2-6 tiny seeds stuck together inside it. This means one planting spot sprouts multiple plants that compete for the same water and nutrients in a tiny space of soil.
Thin your seedlings when plants reach about 3 inches tall by snipping extras at soil level with scissors. Leave one strong plant every 3-4 inches along your row for best root results. This single step fixes most beets not growing to full size in home gardens everywhere.
Water problems cause the second most common beet growing problems after crowding issues in the garden. Roots that dry out between waterings turn tough and woody inside where you can't see the damage happening. Keep soil moist with about 1 inch of water per week from rain or your hose to grow tender sweet roots.
Poor soil starves your beets even when you space and water them right all season long. Beets need potassium for root growth and will stay small in worn out garden beds that lack nutrients. Add compost before planting and use a balanced fertilizer to feed your soil what it lacks for root crops.
Weeds steal water and nutrients from your beets during the first six weeks when plants are small and weak. Pull weeds as soon as you spot them before they get big enough to shade out your young seedlings. This early care sets your beets up for strong root growth later on in the season.
Check all these factors if your beets stay stubbornly small despite your best efforts in the garden each year. Fix spacing first since crowding causes the most problems by far for root size. Then make sure your watering stays consistent and your soil has the nutrients beets need to bulk up.
Read the full article: Growing Beets for Sweet Roots and Greens
