Understanding Second Early Potatoes and Their Planting Window
The optimal time to plant second early potatoes in the UK typically falls between March and early May. These varieties are a vital bridge between the very first earlies and the maincrop harvest, offering a balance of speed and yield. Knowing when to plant second early potatoes is paramount for success; too early, and the risk of frost damage to emerging shoots is high, while planting too late can shorten their growing season, impacting tuber development.
- Plant from March to early May for best results.
- Protect young shoots from late frosts.
- Consider soil temperature for reliable germination.
- Second earlies bridge early and maincrop harvest times.
Choosing the right moment depends on several factors, not just the calendar. Soil temperature is a significant indicator; potatoes generally require the soil to be at least 7°C (45°F) for reliable germination and growth. While March might seem early, particularly in cooler regions of the UK, the latter half of the month can be suitable if the ground has warmed sufficiently. Many gardeners opt for chitting their seed potatoes beforehand, which means pre-sprouting them. This process encourages stronger, earlier growth once planted, making the timing of planting even more critical to avoid chilling or damaging these delicate sprouts.
The type of soil you have also plays a role. Heavier clay soils retain warmth for longer than lighter, sandier soils. Therefore, planting might be advisable slightly later in clay soils to avoid waterlogging and cold conditions that can rot seed potatoes. Conversely, sandy soils warm up quicker but may require more consistent moisture. Assessing your specific garden microclimate, such as sheltered spots versus exposed areas, will also inform your decision. For those planting in containers or growing bags for potatoes, the environment is more controlled, potentially allowing for slightly earlier planting as you can offer more protection.
Assessing Soil Conditions for Planting
Before you even consider digging, it's wise to check the soil. A simple test involves squeezing a handful of soil; if it forms a solid ball that doesn't crumble, it's too wet. If it crumbles easily, it's about right. This ensures you're not compacting cold, wet soil, which is detrimental to developing tubers and can lead to disease. Warming the soil in the weeks leading up to planting can be achieved through methods like covering the planting area with fleece or cloches, though this requires careful monitoring to prevent overheating.
The most crucial aspect of planting second earlies is their resilience. They are generally more robust than first earlies but still require a decent period of growth before the autumn frosts arrive. Aiming for a planting date that allows them at least 10-12 weeks of growth before you anticipate harvesting them is a good rule of thumb. This period allows the tubers to swell and mature properly, yielding a satisfactory crop.
When to Plant Second Early Potatoes Based on Location and Frost Risk
The geography of your garden within the UK significantly influences when to plant second early potatoes. While national advice often suggests March to May, regional variations are substantial. In the warmer, more sheltered southern regions, planting can often commence in March, especially from mid-month onwards, provided the last frost risk has diminished or precautions are in place. Northern Scotland, higher altitudes, and exposed coastal areas in the north will likely need to wait until April, sometimes even late April or early May, to minimise the danger of late frosts nipping any emerging foliage.
Understanding your specific microclimate is more valuable than adhering strictly to a date. Late frosts can be unpredictable and devastating to young potato plants. If you've already chitted your seed potatoes, tender shoots will be visible. If a late frost is forecast after you've planted, covering the emerging rows with horticultural fleece or cloches offers vital protection. This is a key strategy for gardeners who wish to plant earlier to maximise the growing season without risking their crop.
Protecting Your Crop from Frost
A common mistake is planting too early and then being caught out by unexpected cold snaps. While it’s tempting to get them in the ground, the risk of losing precious sprouts to frost can set your crop back considerably. If you plant in March and shoots emerge before a frost, you can often save them. Mounding soil (earthing up) around the base of the plant not only helps suppress weeds and encourages tuber formation but also provides a protective layer for the vulnerable stem and any developing shoots just below the soil surface. If frost is severe, covering the entire area with fleece is your best defence.
For those growing potatoes in pots or containers, the advantage is greater mobility. You can move pots into a sheltered location, such as a greenhouse or cold frame, or bring them indoors on frosty nights. This offers a much higher degree of control over the planting time and protection, allowing you to potentially plant a week or two earlier than those cultivating in open ground, even in more northerly or exposed garden locations.
The decision to plant is best made by observing your specific garden conditions rather than relying solely on a calendar date.
Pro-Tip: Chit your seed potatoes by placing them in an egg box in a bright, cool location for 2-4 weeks before planting. This encourages strong, stubby sprouts to form, giving your plants a head start once they are in the ground and ready to grow.
Optimising Your Planting Technique for Second Earlies
The 'when' is only one part of the equation; 'how' you plant your second early potatoes also significantly influences your harvest. Whether you are planting directly into the soil, using growing bags for potatoes, or opting for containers, the core principles remain similar: provide good drainage, adequate nutrients, and protection for the emerging crop. For planting directly into the ground, a common method involves digging trenches about 10-15 cm deep. Place your chitted seed potatoes sprout-upwards about 30 cm apart, then cover them with soil.
The spacing is important because potato plants need room to grow both above and below ground. Overcrowding can lead to smaller tubers and increased susceptibility to diseases due to poor air circulation. For second earlies, a general spacing of 30-40 cm between plants and 60-75 cm between rows is advisable to allow for adequate development and for the earthing-up process.
Planting Methods: In Ground vs. Containers
In the Ground: Prepare your soil by digging and adding compost or well-rotted manure. Dig trenches, place seed potatoes, and backfill. As the plants grow, earth them up by drawing soil up around the stems to cover the developing tubers, protecting them from light and encouraging further growth. This process typically happens twice during the growing season.
| Method | Pros | Cons |
|---|---|---|
| Directly in Ground | Good yield potential, established method. | Requires open space, susceptible to soil-borne pests. |
| Growing Bags/Pots | Space-saving, controllable environment, cleaner harvest. | Requires more watering, smaller yields than large plots. |
Growing Bags for Potatoes/Containers: These offer excellent flexibility. Start by adding a layer of compost to the bottom of the bag or pot, place your seed potatoes on top, and cover with a few inches of compost. As the foliage grows, continue adding compost to the bag or pot, leaving just the top leaves exposed. This method simplifies earthing up and is ideal for patios or balconies. Ensure containers have drainage holes and are of sufficient depth (at least 30-40 cm for good tuber development).
Choosing between planting in the ground or in containers is often dictated by available space and desired convenience. Both methods can yield excellent results with second early potatoes, provided the fundamental needs of the plant – light, water, nutrients, and protection – are met. The key is to ensure the seed potatoes are planted at the correct depth and have ample space to develop into the delicious tubers you expect.
What to Do After Planting: Care and Expectations
Once your second early potatoes are in the ground, patience and vigilant care are key. The first shoots typically emerge 2-4 weeks after planting, depending on soil temperature and moisture. As soon as these shoots appear, or when plants reach about 15 cm tall, it’s time to begin earthing them up. This involves drawing soil from between the rows up around the stems to form a ridge.
Earthing up serves multiple purposes. It prevents the developing tubers from being exposed to sunlight, which turns them green and makes them inedible (due to solanine). It also provides a protective layer against frost and encourages the plant to produce more tubers along the buried stem. For plants in bags or pots, you simply add more compost around the stem as it grows, effectively continuing the earthing-up process.
Monitoring for Pests and Diseases
Keep an eye out for common potato pests like slugs and aphids, as well as diseases such as blight. Good air circulation, proper watering (avoiding waterlogged conditions), and prompt removal of affected foliage can help mitigate these issues. Companion planting with herbs like basil or catnip can sometimes deter pests naturally. Regular inspection allows for early intervention, which is far more effective than treating advanced problems.
The most critical factor for a successful harvest of second early potatoes is consistency in watering, especially during dry spells once the plants are established.
Pro-Tip: If you're growing in a small space or want a cleaner harvest, consider using purpose-made potato grow bags. These often have a skirt that can be lifted to allow easy access to the developing tubers without disturbing the main plant too much.
When to Expect Your Harvest
Second early potatoes are typically ready for harvest approximately 10-12 weeks after planting. This means if you planted in mid-April, you could be looking at a harvest from late June to mid-July. Harvesting too early might yield small, immature potatoes, while waiting too long can increase the risk of disease or slug damage, and the tubers might become overly large and lose their desirable texture for many culinary uses. A good way to check is to carefully scrape away a little soil around a plant to see the size of the tubers. If they are of a usable size and have begun to form a skin that doesn't rub off easily, they are likely ready.
For many gardeners, the joy of growing second earlies lies in their ability to provide fresh, delicious potatoes relatively soon after the first earlies, without the longer wait associated with maincrop varieties. By selecting the right planting time, preparing the soil or containers correctly, and providing consistent care, you can ensure a rewarding crop.