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    Use code AUTUMN15 in the basket min order £449 (Greenhouses)

    "Grow with ease and confidence in the Palram - Canopia 8x20 Grand Gardener Greenhouse, designed for durability and optimal growing conditions. With its sturdy resin frame, UV protection, and ample ventilation, this greenhouse is a must-have for gardeners and allotment owners. Backed by a 5-year warranty for peace of mind."

    More Sizes:

    Add a Base Plinth (Recommended):

    Do I need a Base Plinth?

    Vitavia Greenhouse Base Plinth

    Add a galvanized steel base plinth for strength and stability. Ideal for placing straight onto slabs or concrete. Includes corner posts for soft ground installations. Your greenhouse MUST sit on a raised plinth. You can build one from bricks, timber or easiest is to buy this base plinth with your new greenhouse.

    Base Kit + £347

    Add Palram - Canopia Ventilation?

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    Palram - Canopia Ventilation information

    Palram - Canopia Automatic Vent Opener - £45.00
    Palram - Canopia Automatic Vent Opener

    Add an autovent that will automatically open your roof vent to ventilate your greenhouse.


    Palram - Canopia Louvre Vent - £101.00
    Palram - Canopia Louvre Vent

    This 10 blade louvre vent will help ventilate your greenhouse by letting in cool air to circulate around the greenhouse.


    Add Palran - Canopia Greenhouse Options?

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    Drip Irrigation Kit
    + £36
    Trellising Kit
    + £45
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    Palran - Canopia Greenhouse Options information

    Palram - Canopia Steel Work Bench - £77.00
    Palram - Canopia Steel Work Bench

    This heavy duty steel work bench with lower shelf is ideal for working in the greenhouse as well as storage.


    Plant Hangers - £8.00
    Plant Hangers

    Plant hangers screw into the frame and allow you to run wires or string from floor to roof for growing vine plants.


    Drip Irrigation Kit - £36.00
    Drip Irrigation Kit

    Connects to water tap. Has a drip regulator to control dispersal.


    Trellising Kit - £45.00
    Trellising Kit

    Easily hang your plants and vine crops.
    6 Roller Hooks Spool & twine
    6 Metal Shims
    48 Tomato/Pepper Clips
    12 Radial Support Hooks - Tomatoes + Cucumbers
    12 Courgette Clips


    Palram - Canopia 2 Tier Staging - £63.00
    Palram - Canopia 2 Tier Staging

    Heavy Duty resin 2 tier staging with drainage holes for plant storage.


    The Palram - Canopia 8x20 Grand Gardener Greenhouse is tough and ideal for the UK’s often blustery, wet weather. The Grand Gardener is perfect for family gardens or allotment use as it’s polycarbonate glazing won’t shatter.

    The Grand Gardener 8ft x 20ft Greenhouse is made from poly resin which won’t bend or discolour like aluminium. Complete with it’s crystal clear side glazing to let in light and the 4mm polycarbonate glazing for the roof it offers great growing conditions whilst protecting your plants from scorching from excessive UV rays .This greenhouse weighs in at 641 lb’s making it a good sturdy weight which will help it to survive harsh wind and snowy conditions.

    The Grand Gardener 8 x 20 has a four opening roof vent and double outward opening doors with locking latch. Palram - Canopia greenhouses are very easy to assemble as they use a unique snap-together system making it easy to do-it-yourself.

    • Easy to Build
    • 2.59m (8ft 6") Wide Greenhouse - Perfect for garden or allotment
    • Green Thick Resin Frame - Tough and Rigid
    • Barn Shaped Roof - Optimum growing height
    • Clear Polycarbonate Side Panels - Great Light Transmission.
    • 4mm Twin Wall Polycarbonate Roof - UV Protection for Plants
    • Double Doors with latch - Easy access
    • Lockable Door Handle - Secures door in place for good wind resistance.
    • 4 Opening Roof Vents - For Ventilation.
    • 5 Year Warranty - Covers Rust and Discolouration

    1-Man Deliveries: Your new Palram Shed or Greenhouse will be delivered within 3-5 working days.

    2-Man Deliveries: Larger items will be delivered within 7-10 working days.

    You will receive a text message from Arrow XL to schedule your delivery. Please respond as soon as possible to ensure prompt delivery.

    Greenhouse Size Diagram

    Greenhouse Dimensions

    A: Greenhouse width

    2590mm (8′ 5″)

    B: Greenhouse depth

    6310mm (20′ 8″)

    C: Ridge height

    2375mm (7′ 9″)

    D: Eaves height

    1940mm (6′ 4″)

    E & F: Door Size

    1200mm (3′ 11″) x 1700mm (5′ 6″) (aperture)

    Minimum Base Size

    2590mm (8′ 5″) x 6310mm (20′ 8″)