Garland 28-Cell Deep Root Propagator | For Sweet Peas, Beans & Climbers

For plants that need proper root depth from the very start — sweet peas, broad beans, climbing beans, morning glory, cosmos and other long-rooted seedlings — the Garland 28-Cell Deep Root Seed Success Kit is properly the right tool. 12cm deep cells give roots the genuine downward run they need during early development, while the Fast Root engineering (split cells, ridged sides, air pruning) supports stronger plants ready for transplanting. At £17.25 it's the dedicated deep-cell propagator for the gardener growing the kind of plants that fail in shallow seed trays.

From Garland, the established British horticultural brand specialising in propagation, greenhouse and growing equipment. Made from durable injection moulded plastic; built to last multiple seasons.

Why depth matters — the tap root problem

Some plants properly need deep root run from the very start, and standard 5-6cm seed trays don't give them enough vertical space. The classic examples are:

• Sweet peas — legendary for their need for deep root development. Sweet peas grown in shallow trays develop kinked, J-rooted seedlings that struggle to establish. Deep cells (or root trainers / loo-roll cardboard tubes traditionally) are properly the right answer
• Broad beans — develop a substantial taproot in early growth; shallow trays restrict this and slow establishment
• Runner beans and French beans — similar to broad beans; benefit significantly from deeper root run
• Climbing plants generally — morning glory (ipomoea), nasturtiums (tropaeolum), other climbers all develop deeper roots early
• Long-rooted annuals — cosmos, larkspur, some grasses
• Sweet corn — properly needs depth to develop the support root system
• Many vegetables for autumn planting out — brassicas, leeks, and others raised to bigger transplant size

For these plants, raising in shallow cells produces compromised seedlings. The 12cm depth of the Deep Root propagator gives proper downward root run, producing significantly stronger young plants for transplanting.

The 28-cell Deep Root specifications

• 28 individual deep cells — properly the right capacity for a serious season's sowing of deep-rooted plants
• 12cm cell depth — more than twice the depth of standard propagator cells (5.8cm). Real root development space
• Split cell design — each cell opens like a clamshell; inspect root growth and remove seedlings without disturbance
• Internal ridged sides — vertical ribs guide roots downward rather than letting them spiral. Plants establish faster after transplanting
• Central drainage hole per cell — proper drainage prevents waterlogging
• Four side ventilation slots per cell — natural air pruning when roots reach the slots; forces fibrous root branching rather than long single taproots
• Adjustable dial ventilator in the clear propagator lid — properly engineered control of airflow and humidity, not just simple vent holes
• Injection moulded durable plastic — built for years of repeated use
• Dishwasher-safe — clean and sterilise between sowings

This is properly the most technically sophisticated propagator in our range — deep cells + all the Fast Root features in one product.

How it differs from our other propagators

Important note: this Deep Root propagator does not include the self-watering reservoir and capillary matting of our 12-cell, 24-cell Standard, and 24-cell Fast Root propagators. The depth design takes priority over the self-watering format. You'll need to water each cell directly — either by misting from above, by hand-watering, or by setting the propagator on a tray with bottom watering.

For self-watering with shallower cells, choose one of the other propagators in our range. For deeper root development without self-watering, this is properly the right tool.

The split cell innovation — why it matters with deep cells particularly

The split cell design is especially valuable with deep cells. Removing a seedling from a 12cm deep traditional cell is genuinely difficult — you can't easily push it out from below without damaging the long root system that's developed inside. The split cell approach eliminates this:

• Open each cell when ready — the two halves separate cleanly
• Lift out the seedling intact — with the entire deep root system visible and undisturbed
• Inspect root development — properly important for deep-rooted plants where root quality can vary significantly
• Transplant with minimal stress — the plant goes into its permanent position with the same root structure intact

For sweet peas particularly, the ability to see and lift the entire root system intact is genuinely transformative. No more guessing whether the taproot is straight or kinked; no more breaking off the lower roots during transplanting.

What you'll grow in it

• Sweet peas — the headline use; properly the right propagator for serious sweet pea growing. The deep cells let the characteristic long taproot develop straight
• Broad beans — sow in autumn for overwintering, or spring for May/June cropping
• Runner beans and French beans — raise indoors before planting out after the last frost
• Morning glory (Ipomoea) — the warmth-loving climber; deep cells suit its early root development
• Nasturtiums — can be sown directly but plug plants establish faster
• Cosmos — properly the right propagator for raising cosmos to substantial plug size before transplanting
• Sweet corn — needs depth for support root development
• Brassicas raised to plug stage — cabbages, kales, broccolis, cauliflowers
• Leeks — the deep cells properly suit leek seedling development
• Cuttings propagation — soft and semi-ripe cuttings of lavender, rosemary, salvia, pelargonium, fuchsia
• Tree and shrub seeds — many tree species develop substantial taproots in their first year; deep cells properly suit this

For tomatoes, peppers, chillies and herbs that don't need deep root development, the shallower 12-cell or 24-cell propagators in our range are more appropriate.

Particularly good for

• Sweet pea enthusiasts — the right tool for serious sweet pea cultivation; many growers consider deep cells essential
• Allotmenteers — raise proper plug plants of beans, climbers, brassicas, and corn for the plot
• Cottage garden growers — cosmos, sweet peas, and other tall annuals at proper transplant size
• Cut flower growers — sweet peas and cosmos are staples of the cutting garden; deep root development gives better cut flowers
• Climbing plant growers — morning glory, sweet peas, nasturtiums, tropaeolum varieties
• Bean growers — raise indoor-started broad beans, runner beans, French beans for early planting out
• Greenhouse and conservatory propagators — the proper deep-cell tool for serious propagation work
• Cuttings propagators — the depth suits semi-ripe and softwood cuttings of perennials and shrubs
• Tree and shrub seed growers — many tree species need deep cells for first-year root development
• As a gift for a serious gardener who grows sweet peas or beans — properly considered specialist kit

Where this sits in our propagator range

This is the specialist deep-root option in our four-product Garland propagator range:

• 12-Cell Self-Watering Propagator — £10.35. The starter kit; shallow cells, self-watering, windowsill scale
• 24-Cell Self-Watering Standard — £15.25. Same shallow cells, doubled capacity, self-watering
• 24-Cell Fast Root — £17.85. Shallow cells with split-cell technology, self-watering
• 28-Cell Deep Root (this) — £17.25. Deep 12cm cells with split-cell technology; not self-watering

The right choice depends on what you're growing:

• Shallow cells (5.8cm) are sufficient for tomatoes, chillies, peppers, herbs, salad leaves, many half-hardy annuals, brassicas to small plug stage
• Deep cells (12cm) are essential for sweet peas, beans, climbers, cosmos, sweet corn, leeks, brassicas to large plug stage, tree seeds, deep-rooted perennials

Many serious gardeners eventually want both — a shallow propagator for everyday seed sowing and a deep propagator for the specialist long-rooted varieties.

Built to last — the sustainability story

• Injection moulded plastic construction — properly durable for years of repeated use
• Designed for multi-season use — this isn't a single-season disposable product
• Dishwasher-safe — cleanable and sterilisable between sowings, preventing disease carry-over

The supplier copy doesn't specify recycled plastic content for this product specifically; we'll confirm with Garland.

Where this fits in our broader propagation range

• 28-Cell Deep Root Propagator (this) — specialist deep-cell propagation
• The other three Garland propagators — shallow cell self-watering options
• Fungus Gnat Treatment Bundle — pest protection for indoor compost
• Fungus Gnat Nematodes — standalone nematode treatment
• Smart Garden Digital Max/Min Thermometer — greenhouse temperature monitoring
• Garland Plant Protection Fleece — for hardening off seedlings outside

Specifications

• Brand: Garland (British horticultural specialists)
• Type: Deep-cell propagator with split-cell Fast Root technology
• Cells: 28 individual split cells
• Cell depth: 12cm (significantly deeper than standard propagators)
• Features:
  • Split cell design for root inspection and removal
  • Internal ridged sides for guided downward root growth
  • Central drainage hole per cell
  • Four side ventilation slots per cell (natural air pruning)
  • Adjustable dial ventilator in clear propagator lid
• NOT self-watering — water each cell directly
• Material: Injection moulded durable plastic; dishwasher-safe
• EAN: 5031670004208

About Garland

Garland is an established British horticultural brand specialising in propagation, greenhouse and growing equipment. They've supplied UK growers for decades with the practical kit that makes indoor and undercover gardening work properly. Their products are widely used in commercial nurseries as well as home gardens. We stock their range because they make tools that genuinely improve outcomes for the home grower.

A small thought: there's a particular satisfaction in sowing sweet pea seeds in autumn, watching them develop slowly through the dark months, then opening up a deep cell in February to see a properly substantial root system — a long straight taproot with fibrous side roots, ready to be planted out at the base of a hazel teepee in March. That's the kind of plant that produces sheaves of cut flowers from June through September. Done in a shallow seed tray, the sweet pea seedling never quite recovers; done in a proper deep-cell propagator, it thrives. The right tool for the right plant matters — and for the gardeners who care about sweet peas and beans, this propagator is properly that tool.

- 1 x 28-cell deep root growing tray with split cells
- 1 x clear vented propagator lid with adjustable dial ventilator
- (Compost not included)

- Use a proper seed compost in the cells
- Water cells directly (NOT self-watering)
- Adjust dial ventilator according to germination stage
- Open split cells to inspect roots and remove seedlings when ready
- At end of season, clean and sterilise components in dishwasher
- Store dry; avoid harsh chemicals or solvents