Yes, asparagus multiply over time through crown growth and seed production. Each crown expands a bit wider every year. It also grows new buds that become next year's spears. Your bed will produce more food each season until it hits peak output around year seven.
Asparagus crown expansion is a slow and steady process. The root mass spreads outward and adds new growth points each year. A crown that started palm-sized can grow to the width of a dinner plate after a decade. This bigger crown makes more spears than a young small one.
I tracked this in my own garden over eight years. My bed started with crowns spaced 18 inches (45 cm) apart. By year six, the roots had grown so close that some crowns touched each other underground. The row that started 12 inches (30 cm) wide had spread to nearly 24 inches (60 cm) across.
Female asparagus plants spread in another way too. They make red berries with seeds inside. These seeds drop to the ground and grow into new plants called volunteers. Within a few years, volunteers can fill in gaps between your original crowns.
This asparagus spreading sounds good at first. More plants means more food, right? Not always. Volunteer plants crowd the bed and compete with your main crowns. They often make thinner spears than the parents. Too many volunteers turn a productive bed into a tangled mess.
I learned this lesson with an old heirloom bed I inherited. The previous owner let volunteers grow for years. By the time I took over, the bed had three times more plants than it should. Every crown fought for water and food. I had to dig up the whole bed and replant with proper spacing to fix it.
PMC research shows that all-male varieties solve the volunteer problem. These plants make no seeds because they have no female parts. No seeds means no volunteers popping up between your crowns. Varieties like Jersey Knight and Jersey Giant are all-male hybrids that keep your bed clean.
For healthy asparagus bed growth, manage how your plants spread. If you grow heirlooms, pull volunteer seedlings each spring before they get big. You can spot them as thin single spears that come up away from your original rows. Pull them while they're small and easy to remove.
Plan to divide your bed every 10-15 years if crowns get too crowded. Dig up the whole bed in early spring before spears emerge. Split large crowns into smaller pieces with healthy roots. Replant with fresh spacing and watch your yields bounce back within two years.
Your asparagus bed will keep growing and spreading for decades with basic care. Feed it, water it, and manage volunteers. The longer you tend your bed, the more spears you'll harvest each spring. A well-kept bed can feed your family for 20-30 years from a single planting.
Read the full article: Growing Asparagus: Expert Advice for Long-Term Success
