Thompson & Morgan Review: My Season-Long Journey From Plug Plants to Full Bloom
Unboxing tender plugs, testing seed germination rates, and harvesting heritage tomatoes. Here is my honest, real-life experience with Britain’s iconic mail-order nursery.
Every spring in Britain comes with a quiet, irresistible itching in the fingers. As the winter chill finally recedes from the soil, any gardener worth their secateurs starts dreaming of overflowing patio tubs, fragrant sweet peas climbing up bamboo tepees, and homegrown tomatoes ripening in the greenhouse. Last spring, after moving into a house with a lawn that resembled a abandoned football pitch, I decided it was time for a complete garden overhaul.
Living in Surrey, my local garden centres are lovely for a weekend stroll, but their selection of specialized varieties is often limited, and buying fully grown potted perennials for a large border gets astronomically expensive very quickly. That is when I turned to Thompson & Morgan. Established back in 1855, they are arguably the UK’s most famous mail-order seed and plant nursery, boasting an encyclopedic catalogue ranging from heritage vegetable seeds to tender plug plants and rare perennial collections.
However, ordering living plants through the Royal Mail post is naturally nerve-wracking. Will delicate seedlings arrive squashed? Are the plug plants as tiny as internet rumors claim? And does their 100% Quality Satisfaction Guarantee actually hold up if a tray fails to thrive? Over the past 12 months, I placed three separate orders: early spring seeds, a mid-season tray of bedding plug plants, and bare-root winter fruit bushes. Here is my complete, unvarnished review of the experience.
Our Verdict: Unbeatable Variety for Hands-On Gardeners
Thompson & Morgan is an exceptional resource for British gardeners who want access to rare plant varieties, top-performing F1 seed hybrids, and budget-friendly plug plant collections. Their seed germination rates are consistently high, and their value-pack plug trays allow you to fill entire borders for a fraction of local garden centre prices. However, success requires realistic expectations: plug plants arrive small and require immediate potting-on in a greenhouse or windowsill before planting out. If you enjoy the process of “growing on” your plants and take advantage of their seasonal promotional offers, Thompson & Morgan offers some of the best horticultural value in the UK.
Thompson & Morgan at a Glance
Check current plant and seed offers at Thompson & Morgan →
✅ What I Loved
- Incredible Variety: Thousands of flower & veg seeds, including exclusive award-winning cultivars.
- Cost-Effective Plugs: Bulk plug plant bundles save up to 70% compared to potted garden centre stock.
- High Germination Rates: Outstanding performance from their seed packets (90%+ success in my trial).
- Robust Guarantees: 100% Satisfaction Guarantee with straightforward replacement or credit support.
- Clever Packaging: Blister-moulded plastic clamshells keep delicate plugs moist and upright during transit.
- Expert Growing Advice: Comprehensive online guides and planting notes supplied with every order.
❌ Things to Watch For
- Plugs Require Care: Standard plugs are small seedlings; they are not “garden-ready” out of the box.
- Peak Season Delivery Windows: Dispatch during April and May can experience slight delays during sales events.
- Multiple Parcel Arrivals: Split shipments occur naturally as different plant varieties reach dispatch maturity.
My Personal Experience: From Box to Border
1. The Seed Test: Germination & Heritage Tomatoes
My journey began in February with an order of flower and vegetable seeds. I picked up their famous Sweet Pea ‘High Scent’, Cosmos ‘Fizz Pop’, and a collection of F1 tomato seeds including ‘Sungold’. The seed packets arrived within four days in sturdy paper mailers.
I sowed the seeds in seed trays using standard multi-purpose compost on a heated propagator windowsill. The results were impressive: the ‘Sungold’ tomatoes sprouted in just 5 days with a 100% germination rate across all 10 seeds. The sweet peas boasts a thick, robust root system after pre-soaking. By April, I had a windowsill crammed with healthy, sturdy green shoots ready to harden off.
Spring beginnings: High germination rates make seed raising rewarding and economical for kitchen gardens.
2. Unboxing Plug Plants: What Do They Really Look Like?
In late April, my second order arrived: a tray of 48 Begonia ‘Nonstop Joy’ plug plants and 24 Petunia ‘Frenzy’ plugs. This is the stage where many first-time buyers panic. When you open the recycled plastic clamshell packaging, you aren’t greeted by flowering potted plants; you see tiny green seedlings nestled in soil plugs about the size of a thimble.
The key to success with Thompson & Morgan plug plants is immediate action. They have been in a dark postal box for 24-48 hours. I gently popped each plug out using a pencil end, potted them up into 9cm pots with fresh compost, watered them thoroughly, and placed them in my unheated greenhouse. Within 10 days, their root systems exploded, and by late May, I had full-sized, vigorous garden-ready plants ready for my hanging baskets at a third of retail cost.
Potting on: Taking plug plants out of transit packaging and giving them room to grow produces spectacular summer displays.
3. Summer Harvest & Flower Display
By mid-July, the garden had turned into an absolute paradise. The petunias and begonias overflowed from my front door containers, producing a wall of vibrant pink and crimson blooms that lasted well into October. The ‘Sungold’ tomatoes yielded bowl after bowl of sweet, candy-like orange fruit every evening.
During the height of summer, one tray of lavender plugs had arrived slightly squashed due to courier handling. I snapped a photo and used the online contact form on the Thompson & Morgan website. Their customer care team responded within 48 hours and promptly credited my account without any quibbling. That peace of mind makes ordering live plants online completely stress-free.
The reward: Homegrown sweet cherry tomatoes harvested from healthy plants raised from Thompson & Morgan seeds.
Core Rating Metrics
★★★★★ (5.0 / 5)
Unbeatable. From rare heirloom veggies to classic beddings and fruit trees, their catalog is second to none in the UK market.
★★★★☆ (4.8 / 5)
Outstanding. High germination percentages across tomatoes, sweet peas, and cosmos flowers under home growing conditions.
★★★★☆ (4.6 / 5)
Excellent value when taking advantage of multi-buy plug deals or seed multibuy offers compared to physical garden centres.
★★★★☆ (4.5 / 5)
Very reliable guarantee. Damage claims were resolved swiftly with photo evidence, though seasonal phone wait times can vary.
Who is Thompson & Morgan Best For?
You’ll love it if you:
- Enjoy raising plants from seeds or potting on young plug seedlings.
- Want access to unique, award-winning, or rare plant and vegetable varieties.
- Are looking to fill large garden beds or containers on a sensible budget.
- Appreciate ordering directly to your doorstep with a satisfaction guarantee.
You might want to skip if:
- You expect instantly large, fully mature, flowering garden-ready potted plants.
- You don’t have a windowsill, greenhouse, or potting area to nurture young plugs.
Final Thoughts: A Growing Success
Gardening is a journey of patience, learning, and little triumphs. Ordering from Thompson & Morgan allows you to participate in that process from the ground up. By supplying top-quality seeds and healthy young plug stock, they put professional-grade genetics directly into the hands of home growers.
If you are willing to give young plug plants a week or two of care in small pots before planting them out in your garden, the financial savings and visual rewards are immense. I whole-heartedly recommend signing up for their newsletter for seasonal discount codes and diving into their spring catalogue!
Ready to Transform Your Garden?
Browse thousands of seeds, plug plants, and garden offers with Thompson & Morgan’s 100% Quality Satisfaction Guarantee.
Frequently Asked Questions (FAQ)
What are plug plants and how do I handle them when they arrive?
Plug plants are young seedlings grown in small soil plugs. Upon arrival, unpack them immediately, gently pop them out of their blister trays, and pot them on into individual 7cm–9cm pots filled with moist compost. Keep them in a bright, frost-free location like a greenhouse or windowsill for a few weeks before planting into outdoor beds.
What is Thompson & Morgan’s Quality Guarantee?
Thompson & Morgan offers a 100% Quality Satisfaction Guarantee. If any seeds fail to germinate or plants arrive damaged or fail to flourish, you can contact their customer support team with your order details and photos for a prompt replacement, store credit, or refund.
Why do my items arrive in separate packages?
Different plant species mature at different times during the growing season. Seeds and garden accessories ship immediately, while living plug plants or bare-root items are dispatched precisely when they reach optimal planting condition to ensure freshness during transit.
Do they ship outside the UK?
Due to plant health and import/export regulations, Thompson & Morgan primarily delivers within Great Britain. Certain restrictions apply to Northern Ireland and specific Scottish Highland/Island postcodes for live tender plants.