When should I plant Utah Yellow Sweet Spanish onion seeds?
Start Utah Yellow Sweet Spanish onions indoors 8-10 weeks before your last spring frost, then transplant outdoors once the soil is workable. In mild-winter regions you can also direct sow in early spring. This is a long-day variety, so it performs best in the northern and central U.S.
How long do these onions take to mature?
Utah Yellow Sweet Spanish onions are ready to harvest in about 110-120 days from transplanting. The large globe bulbs are mature when the tops yellow and fall over.
How far apart should I space the plants?
Space plants 4 inches apart in rows 12-18 inches apart. Giving each bulb room is important because Sweet Spanish onions grow large, often reaching a pound or more.
How much sun and what zones suit this onion?
Plant in full sun (at least 6 hours daily) in loose, well-drained soil. As a long-day type, Utah Yellow Sweet Spanish grows best in USDA zones 6 and colder, roughly the northern two-thirds of the country.
How many seeds come in the packet?
Each packet contains approximately 275 seeds, enough for a generous row of sweet, mild storage onions.
Are these onion seeds heirloom and non-GMO?
Yes. Utah Yellow Sweet Spanish is an open-pollinated heirloom variety, and all our seeds are non-GMO so you can save seed from your best bulbs.
Are these long-day or short-day onions?
Utah Yellow Sweet Spanish is a long-day onion, so it bulbs best in northern gardens with long summer daylight.
Can I grow these from seed the same year?
Yes. Started indoors early or sown directly in spring, they will size up and mature into full bulbs within the same growing season.
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