How to Grow Sugar Beets

At a Glance

Quick Facts

Factor	Value
Soil texture	sandy loam, nutrient-rich, humus-laden, deeply ploughed (Wikipedia)
Drainage	well-drained
Lifecycle	biennial
Edible parts	root, leaves

Soil & Growing Conditions

Water: moisture-retentive, kept moist until germination (Wikipedia, Strictly Medicinal Seeds)

Growth Stages

Stage	BBCH	Notes
Sowing	0	Direct seed in a shallow furrow in spring, barely covered, tamped and kept moist until rapid germination (Strictly Medicinal Seeds).
Thinning	1	Thin seedlings to about 6in apart (Strictly Medicinal Seeds).
Root development	4	Root swells over about 90-100 days, accumulating sugar content of 12-21% depending on cultivar and conditions (Wikipedia).
Frost-triggered harvest	8	Fall harvest begins with the first hard frost, which arrests photosynthesis and further root growth (Wikipedia).

Harvest & Storage

When to pick: Fall harvest begins with the first hard frost, which arrests photosynthesis and further root growth; average root weight 0.5-1kg, matures in about 90 days (Wikipedia).

Diseases

Beet leaf curl virus

moderate

Wikipedia names this directly.

Rhizomania ("root madness")

high

Wikipedia names this directly: susceptible to rhizomania ("root madness").

Beet yellows virus

moderate

Wikipedia names this directly.

Pests

Aphids

moderate

Aphididae (various spp.)

Likely rather than confirmed: no source names this crop directly, but it shares a species (Beta vulgaris) with Beetroot, which lists this pest.

Beet leaf miner

moderate

Pegomya hyoscyami

Likely rather than confirmed: no source names this crop directly, but it shares a species (Beta vulgaris) with Beetroot, which lists this pest.

What the research guides add

Sugar beet is a field crop, and the NDSU guide for the main US growing region is about timing and plant stand rather than garden technique.

• Sugar beet should be planted as early as weather, soil moisture and temperature conditions permit; the potential for very high yields from early plantings is usually considered worth the risk of frost damage. (NDSU Extension)
• Plant the seed 1 to 1.25 inches deep for maximum germination and emergence. (NDSU Extension)
• NDSU recommends a row width of 22 inches in Minnesota and North Dakota, and says higher, more uniform plant populations are easier to establish on narrow rows. (NDSU Extension)
• A good plant population at harvest is about 175 to 200 uniformly spaced plants per 100 feet of row. (NDSU Extension)

Sources for this section

• North Dakota State University Extension: 2026 Sugarbeet Production Guide (A1698-26)

Section researched and checked on 25 October 2026 by the SoilCommander Editorial Team. How we check facts: editorial policy.

Sources

1. Strictly Medicinal Seeds - Beet, Sugar (Beta vulgaris ssp vulgaris-Altissima group)

   A secondary gardening reference rather than a university or horticultural authority, used for sowing/spacing and edible-use detail Wikipedia's agronomic framing does not cover, not contradicted by it. White-rooted heirloom dating to 1747. Roots edible fresh, grated, or cooked; leafy greens also palatable. Direct seed in spring in a shallow furrow, barely covered, tamped and kept moist until rapid germination, then thinned to 6in apart. Matures in 90 days, biennial growth cycle. Compost worked into the soil or banded below the row improves clay soils.

2. Wikipedia - Sugar beet

   Agronomic detail, cross-checked against horticultural sources. Grows exclusively in the temperate zone; 15-21°C during growing months is most favourable, thriving with cool nights and warm days, performing well at high elevation. Ideal soil is sandy loam, nutrient-rich, humus-laden, moisture-retentive, well-drained, deeply ploughed to allow root penetration. Sown from small seed in spring in temperate climates, harvested in autumn; growing seasons as short as 100 days can produce a viable crop in northern regions. Average root weight 0.5-1kg; sugar content 12-21% depending on cultivar and conditions, modern varieties averaging about 18% sucrose. Susceptible to rhizomania ("root madness"), beet leaf curl virus, and beet yellows virus. Fall harvest begins with the first hard frost, which arrests photosynthesis and further root growth.

These 2 sources are specific to this region. The full list of 3 sources behind this guide (Farmers Weekly, Strictly Medicinal Seeds, Wikipedia) is in the references of our UK guide to sugar beets; they describe the plant itself, which is the same wherever it grows.