Unwins Sweetcorn Strong Star F1 Seeds – Super-Sweet Early Hybrid

Unwins Sweetcorn ‘Strong Star’ F1 Seeds

Sweetcorn ‘Strong Star’ F1 is a vigorous, super-sweet hybrid bred for flavour, reliability and easy harvesting. Producing typically two large, sweet cobs per plant, Strong Star is an early cropper that’s perfect for fresh eating, barbecues and blanching straight from the garden.

This F1 hybrid is easy to pick and performs well sown either under cover or directly outdoors when conditions are right. The tall, strong plants also attract pollinators, making them a welcome addition to vegetable plots and wildlife-friendly gardens.

Pack contains 35 seeds.

Key Features

Super-sweet F1 hybrid sweetcorn

Typically yields two large cobs per plant

Vigorous, early cropper — harvest Aug–Sep

Easy to pick and excellent flavour for roasting, boiling or BBQ

Attracts and supports pollinators

Pack quantity: 35 seeds

How to Grow Sweetcorn ‘Strong Star’ F1

Sowing time: March – May (indoors or outdoors)
Sowing depth: 2.5 cm
Germination: 1–2 weeks
Time to harvest: approx. 4 months (harvest Aug–Sep)

Sow indoors (March–April) in pots or modules and transplant out after hardening off, or sow direct outside from late April–May once soil has warmed. Plant in blocks rather than single rows to ensure good pollination and full, even cobs.

Space plants roughly 90 cm apart in rows 90 cm apart, giving a final plant height of around 1.8 m. Keep plants well watered during dry spells and feed with a balanced fertiliser. Remove suckers only if required; strong, sturdy stems aid support for large cobs.

Harvest when silks dry and the kernels are plump and milky—test by pressing a kernel with your thumbnail.

Growing Information (Specification)

Plant spacing: 90 cm

Row spacing: 90 cm

Plant height: 1.8 m

Sowing depth: 2.5 cm

Sow → flower: ~4 months

Germination: 1–2 weeks

Spread: 90 cm

Pack quantity: 35 seeds

Colour: Yellow

Frequently Asked Questions

Q: Can I sow Strong Star outdoors?
A: Yes — you can sow direct from late April–May when soil is warm. For earlier crops, start indoors in March–April and transplant after hardening off.

Q: How do I ensure good cob set?
A: Plant in blocks (not single long rows) to improve pollination. Keep well watered during tassel and silk formation.

Q: How many cobs per plant?
A: Typically two large cobs per plant under good conditions.

Q: When do I harvest?
A: Harvest in August–September when silks dry and kernels are milky. Pick promptly for best flavour.

Q: Will this attract wildlife?
A: Yes — the flowers attract pollinators and beneficial insects to the plot.

Perfect For

Home growers and allotments

BBQs and summer salads

Fresh-eating, roasting or boiling

Growers wanting a reliable, early sweetcorn variety