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Product specifications and features
Product Description
International Kidney Seed Potatoes
International Kidney Seed Potatoes
International Kidney is a heritage potato variety first introduced in 1879. Officially classed as an early maincrop, it can also be harvested earlier as a first or second early, giving gardeners a choice of textures and culinary uses from the same variety. The attractive, kidney-shaped tubers have shallow eyes, smooth white skin and white flesh. Their cooking qualities change as the potatoes mature, making International Kidney an exceptionally versatile variety.
International Kidney is unusual because it develops from a waxy early potato into a flourier maincrop as it matures. Harvest early for firm salad potatoes or leave the crop in the ground for longer to produce fluffy, versatile potatoes for roasting and mashing.
When lifted in May or June, the tubers have thin skins and firm, waxy flesh. They are ideal for boiling or steaming and serving with butter and mint for a traditional Jersey Royal-style potato.
When lifted around July, the potatoes develop a creamy, firm texture that holds its shape well. They are excellent for potato salads, sautéing, boiling or serving alongside fresh salads.
When left to mature until August or September, the flesh becomes drier, fluffier and more floury. At this stage, the potatoes are ideal for roasting, mashing or making thick-cut chips.
Planting & Growing Instructions:
1. Optional Chitting: Stand seed potatoes eyes-up in a cool, bright place for 4-6 weeks to sprout before planting. Tubers may turn green in the light, this is normal.
2. Best planted after the last frost in Spring (March-April), or up until mid-August if stored correctly. Plant slightly earlier in the South of the UK, and later in North of the UK.
3. Grow International Kidney as a First Earlies for 8-12 weeks, a Second Early in 13-15 weeks, or a Main Crop in 16-22 weeks. Feel for the potatoes size before pulling up to harvest.
4. Protect from frost and blight while growing. Use movable Jamieson Brothers Grow Bags or frost covers, and protect from blight with Jamieson Brothers Blight Guard.
After harvest let the potatoes air dry for a few hours on the soil surface before bagging them up.
Never store them in plastic bags, as the trapped moisture will cause them to rot. Hessian sacks are the best way to store potatoes.
Don't store them next to onions or fruit like apples, as these release gases that make potatoes spoil faster.
Specs & Details
- Botanical name
- Solanum tuberosum
- Plant spacing
- 35cm
Features
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First Early
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Grow Time
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Chef's Choice
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Best for Boiling
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Best for Roasting
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Best for Salads
Planting Calculator
FAQs
Please read our FAQs page to find out more.
Why is buying by weight better than buying by a specific number of tubers?
Buying by weight is the professional merchant standard and ensures you receive the maximum amount of biological energy for your money. While some retailers use high tuber counts to make a bag look full, those tubers are often inconsistent in quality or undersized.
By focusing on weight, we guarantee a reliable volume of high-health stock. This usually results in more individual planting points per kilogram than a count-based bag, giving you a far better return on your investment and a more successful harvest.
Why should I choose Scottish seed potatoes for my garden?
Scotland is globally recognised as a High Health region for potato production. The unique climate and rigorous government standards ensure that the seed is free from diseases and viruses common in other regions. By choosing Scottish seed, you are using the same high-performance stock as commercial farmers. This ensures your garden gets the best possible start for a heavy and healthy crop, whether you are an expert or a first-time grower.
What are the advantages of your seed potato sizing?
Our seed potatoes are sized between 35mm and 60mm depending on the variety. This is known as Single Drop sizing and is the preferred choice for professional growers. These tubers have an intact skin that acts as a natural shield against soil-borne rot.
If you are a beginner or have limited space, these high-vigour seeds are the perfect match for our potato planter bags. Using these bags allows you to control the growing environment perfectly, ensuring a huge harvest even on a patio or balcony.
How many potatoes can I expect to harvest from each seed potato?
You can expect a fantastic return on your investment. For Second Early varieties, a single high-quality Scottish seed potato will typically produce between 5 and 10 potatoes at harvest. To maximise your yield and provide your plants with the premium nutrients they need to thrive, we recommend using our potato planting compost. Formulated with added John Innes for superior structure and a six-month feed, it provides the perfect growing environment to help you achieve a record-breaking crop with ease.
How do you ensure the quality of the seed potatoes?
We use a rigorous double inspection process that goes far beyond the basic requirements. Every batch is certified by SASA (Science and Advice for Scottish Agriculture) and must pass a thorough series of checks before it even reaches us. We then perform over 50 additional in-house quality checks on our farm throughout the picking and packing stages.
This labour-intensive standard ensures that only the most healthy and viable tubers are selected for your order. You can plant with total confidence knowing your garden is backed by professional standards and over a century of expertise.
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