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Sweet Onion, ‘Pentium’

‘Pentium’ onions are easy to grow and so sweet you can eat them raw! They are excellent for cooking. Their sweet and mild flavor makes them perfect for onion rings, salads, or your favorite sauce! ‘Pentium’ Onions are adaptable throughout the country, making them a great addition to your vegetable garden! The yellow-skin globes have sweet, white flesh and produce plentifully.

Onions perform best in well-drained, slightly acidic, fertile soil in full sun. Dry bulbs will be ready for harvest when tops have dried and fallen over naturally, usually in August or September. Lift onions gently with a fork and store in cool, dry conditions.

two 'Pentium' sweet onions
close up image of a single 'Pentium' sweet onion

Plant Details +

Botanical Allium cepa
Family Amaryllidaceae
Height 10-12"
Spacing 4"
Hardiness Zone 3-9
Exposure Full sun
Foliage None
Harvest Fall

Planting/Care Instructions +

Planting Instructions: Plant your Super Sweet Onion Bulbs in the spring (as early as you can work the soil). Plant when the soil is workable. 1. Push the sets 1-2" into the soil at 4" intervals for dry onions. 2. Cover with 1/2" of dirt. 3. Water immediately. Plant the bulbs in well-drained, well-cultivated soil. Plant onions bulbs 4" apart in the row for a 3-5" onion. Gardeners should plant as early as possible (frost will not hurt the bulbs). Four to five weeks after planting, side-dress with additional fertilizer. Place the fertilizer in a narrow band about 2 to 3 inches from the base of the onion plants. You can add manure or organic compost to the soil several weeks before planting. Soil should be tamped down firm before planting. Onions will grow in most types of soil. Onions prefer a slightly acidic soil with a pH of 5.5 - 6.5 for optimal growing. Ensure that the soil is well drained.