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Sierra Blanca Hybrid Onion F1

$499

Sierra Blanca Onion is a hybrid, intermediate-day white onion. Produces jumbo to colossal, globe-shaped white onions with a snowy-white exterior. A great variety for backyard gardeners and market farmers. Allium cepa. 110 days to maturity.

Treatment: Untreated

Description

Be sure to check out our Onion Growing Guide for helpful tips & tricks on how to successfully grow onions in your garden. 

Sierra Blanca Onion is a hybrid, intermediate-day onion with bright white, snowy scales that makes it a great variety for the home gardener and small-scale market farmer. This white onion variety consistency produces huge globe-shaped onions that are in the jumbo to colossal size range.

 

Growing Information

Sierra Blanca Onion can be direct-seeded or transplanted, although we recommend transplanting. For direct-seeding, plant Seeds 2″ apart along the row with a row spacing of 24″. Once seedlings emerge, thin seedlings to a 6″ plant spacing along the row. Plethora Onion Seeds can be planted with our Hoss Garden Seeder. We recommend using a #1 seed plate and modifying the hole size slightly to accommodate the onion variety being planted. For denser plantings, more holes may need to be drilled to accommodate a thicker spacing.

For transplanting, plant one seed per cell in our heavy-duty seed starting trays. Once the green stems reach 6-8″ in length and/or they can be easily pulled from the seed trays, the transplants are ready to go in the ground. Transplant onions 4-6″ apart along the row with a row spacing of 24″. If drip irrigation is used, onions may be planted on double rows with drip irrigation in the middle. We suggest burying the drip tape 3-4″ deep and planting on both sides of the tape.

Sierra Blanca Onion Planting Information

Planting Method: transplant

When to Plant: early spring

Planting Depth: 1/4″

Seed Spacing: 4″

Row Spacing: 12-18″

Days to Maturity: 110

Disease Resistance: Pink Root Rot

Onion Planting Guide

Select an onion variety based on your geographical location. In many cases, intermediate-day varieties can be grown in southern long-day regions and northern short-day regions.

Short-day Onions

Plant in fall and overwinter for a spring harvest

Start the bulbing process when day length reaches 10-12 hours

Intermediate-day Onions

Plant in late winter for an early summer harvest

Start the bulbing process when day length reaches 12-14 hours

Long-day Onions

Plant in spring for a mid-summer harvest

Start the bulbing process when day length reaches 14-16 hours

 Onions are heavy feeders and will require significant nutrient inputs throughout their lifespan. We recommend feeding them with our 20-20-20 and Calcium Nitrate fertilizers. Fertilize with 20-20-20 shortly after transplanting. The phosphorous and potassium in the 20-20-20 fertilizer will help to promote solid root development, while the nitrogen will promote vegetative growth. Once transplants are established, we recommend side-dressing or injecting with our Calcium Nitrate fertilizer. Side dress or inject 1 cup per 20 feet of linear row every 3-4 weeks after transplanting.

Customer Reviews

Based on 2 reviews
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C
Cecil Williams
Onion slow start or failure

16 days in a controlled environment, glow lights and Pro Mix soil. I’m guessing 60% germination rate.

F
Franco
5 out of 5

I seem to consistently have problems with my onions. I think its because not enough water and too much week pressure, but not sure . However this variety was my best effort ever. I had many baseball to softball size onions. I was about to give up but will keep trying and will try these again. This season was my only season and to grow these and my first season to have consistent onions.