Radish 'Non Plus Ultra'

Once seeds have germinated, keep them evenly watered. Dry spells with cause roots to get hot and pithy.

Plant in a location that enjoys full sun and remember to water moderately. Keep in mind when planting that Non Plus Ultra is thought of as half hardy, so although it can survive a small mild cold snap, it is wise to ensure that this plant is protected from frost damage. Ideally plant in loamy, clay and sandy soil and try to keep the ph of your soil between the range of 5.5 and 6.8 as Non Plus Ultra likes to be in weakly acidic soil.

Sow 0.47 inches (1.2 cm) deep with a guideline distance of 0.98 inches (2.5 cm). Soil temperature should be kept higher than 13°C / 55°F to ensure good germination.

By our calculations, you should look at sowing Non Plus Ultra about 28 days before your last frost date.

Do not transplant. Sow in stone-free soil in early spring to early summer, and again in late summer for fall crop (if desired). Thrives in cool weather. Make successive sowings every 2 weeks. The recommendation for most root radishes is to directly sow them 4 weeks prior to your last frost date. However, you can start sowing as soon as the ground has thawed and air temperatures are averaging over 40 degrees on most days. Depending on what your springs are like (short and fast, long and drawn out), these conditions may emerge much sooner than or much later than the 4 week guide might suggest. Don’t be afraid to experiment with your start date. Cloches can be used for extra-early plantings.

Ensure that temperatures are mild and all chance of frost has passed before planting out, as Non Plus Ultra is a half hardy plant.

Non plus ultra means “the uttermost point; perfection” in French.