When and How to Sow Parsnips
Parsnips are best sown directly into the ground from late February to April. Waiting until the soil has warmed sufficiently is crucial for germination, as they require a temperature of at least 7°C to sprout reliably. Avoid sowing too early in cold, wet conditions, as this can lead to poor germination and rotting seeds. Choose a sunny spot with well-drained soil, as parsnips dislike waterlogged conditions.
- Sow parsnips directly outdoors from late February to April.
- Ensure soil temperature is at least 7°C for reliable germination.
- Select a sunny location with well-drained soil.
- Prepare the ground deeply to accommodate long root growth.
Preparing the soil is a foundational step when growing parsnips. They are deep-rooted vegetables, so the ground needs to be dug deeply, ideally to a depth of at least 30cm. Remove any stones, rocks, or perennial weeds, as these can hinder root development and cause misshapen or forked roots. Parsnips thrive in fertile, but not overly rich, soil. Heavy applications of fresh manure in the planting year can lead to forked roots and susceptibility to disease. Instead, incorporate well-rotted compost or manure into the soil the autumn before sowing.
Sowing Parsnip Seeds Effectively
When sowing parsnips, create a shallow furrow about 1-2cm deep. Parsnip seeds can be slow to germinate, sometimes taking several weeks. To help speed this up and ensure good germination rates, some gardeners soak seeds for a few hours before sowing or sow them in a peat strip, which can then be laid into the trench. Sow seeds about 10-15cm apart. If you're sowing multiple rows, space them about 30-45cm apart. Once germinated, thin the seedlings to the strongest one at each intended final spacing point. This ensures each plant has adequate room to develop its characteristic long taproot. Thinning is best done on a damp evening to minimise transplant shock for the seedlings you remove.
Essential Parsnip Care and Cultivation
Once your parsnip seedlings are established and thinned, they require consistent care to thrive. Regular watering, especially during dry spells, is important to prevent the soil from cracking and to encourage steady growth. However, avoid overwatering, which can lead to fungal issues. Mulching around the base of the plants with a layer of organic matter, such as straw or compost, can help retain soil moisture, suppress weeds, and keep the soil cool.
Keep the area around young parsnip plants free of weeds by hand-weeding or very shallow hoeing, as their roots are sensitive to disturbance.
Feeding Your Parsnips
Parsnips generally do not require heavy feeding, especially if the soil was well-prepared with organic matter the previous year. Over-fertilising, particularly with high-nitrogen feeds, can promote leafy growth at the expense of root development and can also lead to forked roots. A general-purpose fertiliser can be applied sparingly at the time of sowing, or a liquid feed can be given during the growing season if plants appear to be lacking vigour. However, for most home gardens, good soil preparation is sufficient nutrition.
Parsnips are one of the few vegetables that improve in flavour after a period of frost.
Pest and Disease Management
Parsnips can be susceptible to a few pests and diseases, though they are generally quite hardy. The most common issue is canker, a fungal disease that causes brown or black lesions on the roots and a fuzzy grey mould. This is often exacerbated by poor soil drainage, insufficient spacing, or leaving roots in the ground too long after harvest. Good garden hygiene, crop rotation, and ensuring good air circulation around plants can help prevent its occurrence. Slugs can also be a nuisance, particularly to young seedlings; barriers or organic slug pellets can be used if necessary. Avoid planting parsnips where other members of the root vegetable family, like carrots or potatoes, have been grown in the last few years to break disease cycles.
Harvesting and Storing Your Parsnips
Parsnips are typically ready for harvest from late autumn through to early spring, generally about 18-20 weeks after sowing. Many gardeners find that a period of frost actually improves the flavour of parsnips, making them sweeter and more palatable. You can begin harvesting them once the roots have reached a desirable size, usually from October onwards. If you wish to leave them in the ground over winter, ensure the soil is well-mulched to protect them from severe frost and to make them easier to lift.
How to Harvest Parsnips
Harvesting parsnips is straightforward. On a dry day, loosen the soil around the root using a garden fork. Be careful not to damage the roots with the fork tines. Once loosened, grasp the parsnip by its leaves and pull it gently from the ground. If the roots are still firmly embedded, a little more loosening may be required. It's advisable to harvest only what you need, as parsnips can be left in the ground over winter. If you plan to store them, twist off the green tops immediately after harvesting; leaving them attached can draw moisture from the root.
Storing Parsnips
Parsnips store exceptionally well. Roots can be left in the ground through winter in colder climates, provided the soil is mulched. For longer-term storage, trim off the leaves and store the roots in a cool, dark place. They can be kept in a root cellar, a cool pantry, or even the vegetable drawer of your refrigerator. For optimal storage in a fridge, wrap them loosely in damp paper towels or place them in a perforated plastic bag. Properly stored, parsnips can last for several weeks, retaining their texture and flavour.
Parsnip Growing Alternatives and Considerations
While direct sowing is the standard method for growing parsnips, understanding alternatives and common considerations can enhance your gardening success. Parsnips are not typically grown from modules or transplanted, as their long taproot is easily damaged, which can lead to forking. However, some specialist seed companies offer pelleted seeds, which can make sowing tiny parsnip seeds easier and more accurate, reducing the need for thinning.
Consider companion planting; parsnips can do well alongside plants that don't compete for soil nutrients, like peas or beans, which also fix nitrogen into the soil.
Troubleshooting Common Parsnip Problems
The most frequent query relates to why parsnips don't grow well. Often, this comes down to soil conditions. If the soil is compacted or full of stones, roots will fork. If the soil is too rich in fresh manure, similar issues arise, along with increased disease risk. Poor germination can be due to sowing too early in cold, wet soil, or simply due to old seed; always check the seed packet's viability date. Persistent canker is usually a sign of poor drainage or inadequate crop rotation. Growing parsnips requires patience, as they are slow to establish and mature.
When to Plant Garlic and Onions
While parsnips are sown in spring, other root vegetables have different timings. For instance, garlic is often planted in autumn for a summer harvest, or in early spring. Onion sets are also typically planted in spring, from March onwards, once the soil is workable. Knowing the planting times for different vegetables, like growing onions or when to plant garlic, helps in planning your garden layout and crop rotation effectively, ensuring each crop has the optimal conditions to thrive alongside your parsnips.