Sankey Grostart Propagator Midi Unheated 38cm

Start seeds and root cuttings successfully with the Sankey Grostart Propagator Midi Unheated 38cm, a compact unheated propagator from Strata Products' Grostart propagation range. Designed for UK gardeners who want to extend the sowing season on a windowsill, greenhouse shelf or kitchen worktop, the 38cm Midi creates a stable microclimate around young plants - no pins, cables or thermostat required.

Ideal for sowing tomatoes, chillies, salads and bedding plants, taking softwood and semi-ripe cuttings, or bringing on bought-in seedlings before they go outside, this Midi propagator is the perfect size for smaller greenhouses, allotment benches and bright windowsills. Its low-profile shape fits neatly along a single shelf while still giving generous room for a full seed tray.

Made in the UK from durable recycled plastic, the tough seed-tray base holds compost or seedling modules without leaks, while the crystal-clear, impact-resistant lid lets in maximum light for strong germination. A built-in top-mounted dial controls humidity and airflow at a glance - close as water needs - preventing damping-off and heat stress in young plants. Lightweight, reusable and easy to store between seasons, the Grostart Midi is a reliable staple for any UK grow-your-own setup.

Key Features

• Compact 38cm Midi propagator for windowsills, greenhouse shelves and allotment benches
• Clear, shatter-resistant lid allows full sunlight penetration for strong seedling growth
• Adjustable top-mounted vent dial for precise humidity and airflow control
• Tough, leak-resistant base keeps compost and modules securely in place
• Made in the UK by Strata Products from durable recycled plastic
• Lightweight and reusable - ideal season-after-season for UK growers

Product Details

• Brand: Sankey (Strata Products)
• Manufacturer's Reference: GN452
• EAN: 5012859001836
• Approx. size (D x W x H): 38 x 24 x 19 cm
• Material: Recycled plastic
• Product type: Propagators
• Colour: Black base with clear lid
• Power: Non-electrical

Frequently Asked Questions

What size seed tray does the Sankey Grostart Midi grow?
The base fits a standard 38cm (15") seed tray. Modular inserts and smaller pots up to approximately 24cm wide fit comfortably within the propagator.

Does this propagator need electricity?
No. The Sankey Grostart Midi is an unheated propagator - it relies on natural ambient warmth and sunlight to create a humid microclimate around seedlings and cuttings. No cables, plugs or thermostats are needed.

Can I adjust the airflow?
Yes. The lid features a top-mounted adjustable vent dial that lets you open or close the airflow to control humidity, helping to prevent damping-off and heat stress in young plants.

Is the lid safe if a knock-out happens?
The clear lid is made from a high-clarity, impact-resistant material designed to withstand everyday knocks in a busy greenhouse or potting shed without shattering.

Where should I place the propagator for the best results?
Position the Midi propagator in a bright, warm spot - a south-facing windowsill, greenhouse shelf or heated conservatory works well during the UK spring. Aim for consistent warmth and good daylight, and open the vent during sunny spells to avoid overheating.