The Art and Science of Cultivating Mespilus germanica from Seed

The medlar (Mespilus germanica), a fruit tree with a history stretching back to the Roman Empire and the medieval gardens of Europe, is a fascinating specimen for any home orchardist. While many modern gardeners prefer purchasing grafted saplings to ensure specific fruit characteristics, growing a medlar from seed is a rewarding, albeit patient, horticultural endeavor. To answer your question directly: Yes, you can absolutely plant medlar seeds in a pot, and they will grow, provided you understand the specific physiological requirements of the species.

Understanding Dormancy and Stratification

The primary reason many gardeners fail when attempting to sprout medlar seeds is a lack of understanding regarding seed dormancy. Medlar seeds possess a double dormancy: they require both a period of warm stratification and, crucially, a period of cold stratification to germinate successfully.

In nature, the fruit falls to the ground in late autumn. The pulp decomposes, and the hard, stony seed spends the winter buried under leaf litter, exposed to fluctuating temperatures. If you simply plant a fresh seed in a pot and place it on a warm windowsill, it will likely remain dormant for a year or more, or rot entirely.

To mimic the natural cycle, you must employ stratification. According to the techniques outlined in The Grafter's Handbook by R.J. Garner, which remains the definitive text on the propagation of pome fruits, seeds should be collected from fully mature, "bletted" fruit. Once cleaned of pulp, place the seeds in a moist medium—such as damp sand or vermiculite—inside a sealed plastic bag. Keep them at room temperature for about two months (warm stratification), and then move them to a refrigerator (approximately 3°C to 5°C) for another three to four months (cold stratification).

Selecting the Right Pot and Medium

When you are ready to transition your stratified seeds to a container, the choice of vessel and substrate is paramount. Medlar seedlings develop a substantial taproot early in their life cycle. Therefore, you should avoid shallow trays. Instead, opt for a deep "tree pot" or a long-tom container that provides at least 10 to 12 inches of depth.

The potting medium should be well-draining but moisture-retentive. A mix consisting of 50% high-quality potting soil, 25% horticultural grit or perlite, and 25% organic compost provides the ideal balance. Ensure the pot has large drainage holes; medlars are susceptible to root rot if they sit in waterlogged soil.

The Germination Process

Once your seeds have successfully undergone stratification—you may even see the radicle (the embryonic root) beginning to emerge—plant them at a depth of approximately 1 to 2 centimeters. Position the pot in a sheltered, bright location. While they do not require intense direct sunlight during the germination phase, they do need consistent temperatures.

Be prepared for a slow start. Medlar seeds are notoriously patient. Even with proper stratification, germination can be erratic. Some seeds may sprout within a few weeks of being moved to the warmth of spring, while others may linger in the soil. Patience is a virtue here; do not discard the pot prematurely if nothing appears within the first month.

Caring for Your Seedling

Once the seedling breaks the surface, it will initially look like a small, unassuming shrub. As noted by Jane Grigson in The Fruit Book, medlars are slow-growing trees. In their first year, they will focus almost exclusively on root development.

• Watering: Keep the soil consistently moist but never soggy. As the seedling grows, allow the top inch of soil to dry out slightly before watering again.
• Fertilization: In the first year, minimal intervention is required. Use a balanced, slow-release organic fertilizer at half-strength once the plant has developed its first true leaves.
• Repotting: As the seedling outgrows its container, step it up into a larger pot. Ensure you do not disturb the taproot, as medlars do not transplant well once established.

A Note on Genotype and Fruit Quality

It is critical to manage your expectations regarding the fruit. Because medlars are often cross-pollinated, a seed-grown tree will not be a "true" clone of the parent tree. It will be a hybrid, meaning the size, texture, and flavor of the fruit may differ significantly from the parent. If you are growing the tree primarily for its aesthetic value—its beautiful, twisted branches and large, white spring blossoms—then seed propagation is excellent. If you are seeking a specific cultivar, such as 'Nottingham' or 'Royal', you would eventually need to graft a scion onto your seedling rootstock once it reaches a pencil-thick diameter.

Conclusion

Planting medlar seeds is an exercise in deep horticultural patience. By respecting the tree's need for cold stratification and providing a deep, well-draining environment, you can successfully nurture a seedling into a robust tree. Whether you view it as a long-term experiment in genetics or a decorative addition to your patio, the medlar is a resilient and historically rich species that rewards the diligent gardener. By following the protocols established by pomological experts and providing consistent care, you will find that the journey from seed to sapling is as rewarding as the eventual harvest of the unique, bletted fruit.