Giant Prague celeriac seeds produce a classic heirloom root celery prized for large, knobby roots, creamy ivory flesh, and a mild celery flavor that deepens with cooking. This old-world variety has long been valued in European kitchens for its reliability, storage quality, and rich culinary versatility. The rounded roots develop dense, aromatic flesh that becomes especially smooth and flavorful when roasted, simmered, or puréed. About Giant Prague Celeriac Giant Prague Celeriac is a biennial selection of celeriac, with a clumping/tufted habit and an expected height or spread of 19–24 in. It is best suited to soups, roasting, mash, storage, and cool-season gardens. Notable traits include harvest the swollen stem base when firm and fully developed; celery-like aroma with dense root texture. Treat Giant Prague Celeriac as a named seed line with its own observations, not as a generic stand-in for the entire celeriac crop. History and provenance Celery, leaf celery, and celeriac belong to Apium graveolens and were selected for different edible structures: aromatic leaves, crisp stalks, or a swollen stem base. Their long season and tiny light-sensitive seed remain central to how the crop is grown. Celeriac Seeds – Giant Prague Celeriac belongs to a plant lineage long associated with Mediterranean and Old World garden agriculture. It was selected over generations for kitchen, market, ornamental, or herbal value and remains useful in modern home gardens. Giant Prague celeriac seeds are ideal for soups, stews, gratins, roasts, and traditional root vegetable dishes. Growing facts Scientific name Apium graveolens L. var. rapaceum Life cycle Biennial Maturity 100-109 Days Germination 14-21 Days at 60–75 °F Seed depth Surface Sow Plant height / spread 19–24 in Growth habit Clumping/Tufted Spacing 12 in between plants; 24 in between rows Sunlight Full sun Soil Silt loam; pH 6.0–6.5 Water High Support No-Support Starting Giant Prague Celeriac from seed Surface sow and keep the seed zone evenly moist. Expect emergence in 14-21 Days when the seed-zone temperature is near 60–75 °F. Germination preparation: Start in clean seed-starting mix when season length requires it, then transplant at a sturdy but not root-bound stage. Light requirement: Light required; press seed to the surface without burying. Soaking: None required. Stratification: None required. Scarification: None required. Planting and care Plant during spring/Fall and provide full sun. Space plants 12 in apart with 24 in between rows. Use silt loam with a pH near 6.0–6.5, and follow a high watering plan. Support requirement: No-Support. Frost response: Semi-Hardy. Medium to large container or in-ground bed; avoid crowding Harvest and use Approximately 100-109 Days, from transplanting to market-size swollen stem base. Weather, soil temperature, and planting method can shift the actual harvest date. Harvest: Harvest the swollen stem base when firm and fully developed. Uses: Soups, roasting, mash, storage, and cool-season gardens. Flavor: celery-like aroma with dense root texture. Seed saving: Insect-pollinated umbel crop. Best uses include soups, roasting, mash, storage, and cool-season gardens. Flavor and eating quality: celery-like aroma with dense root texture. Saving seed Select several healthy, true-to-type Giant Prague Celeriac plants that match the expected clumping/tufted habit and overall plant form. Avoid saving seed only from the earliest or largest individual unless that is your deliberate selection goal. Pollination system: Insect-pollinated umbel crop. Compatible plants of the same species can cross through insect activity; wild relatives matter for carrot and parsnip. Separate compatible varieties that may flower together, or use cages, barriers, hand pollination, or another documented control appropriate to the crop. Giant Prague Celeriac is a biennial. Seed production may require overwintering, vernalization, or more than one growing season, depending on climate and crop biology. Clean the seed carefully, dry it thoroughly away from direct heat, label the lot with variety and year, and store it cool, dark, and dry. Test germination before an important planting or distribution season. Common problems Common concerns: Carrot rust fly or root maggot where present, aphids, caterpillars, leaf spots, damping-off, and uneven emergence from crusted soil. Management: Use clean seedbeds, rotation, careful watering, prompt thinning, airflow, and locally appropriate exclusion methods. Diagnosis note: Similar symptoms can have different causes. Compare plants of the same age, record weather and irrigation, and use local Extension or diagnostic support before applying a control. Frequently asked questions Frequently Asked Questions - Giant Prague Celeriac When is Giant Prague Celeriac ready? Use 100-109 Days. Approximately 100-109 Days, from transplanting to market-size swollen stem base. Weather, soil temperature, and planting method can shift the actual harvest date. How long does germination take? Expect 14-21 Days at about 60–75 °F. Cooler, hotter, crusted, saturated, or dry seedbeds can slow emergence. How large does it grow? Expect about 19–24 in with a clumping/tufted habit. Space plants 12 in apart and rows 24 in apart. Support: No-Support. Can it grow in a container? Medium to large container or in-ground bed; avoid crowding Use a container with drainage and enough volume to maintain the listed spacing and steady moisture. Can I save seed? Insect-pollinated umbel crop. Keep compatible varieties isolated and allow selected plants to reach full seed maturity.
