Northfield Garden Studio

Category: Balcony & Container Gardening

  • Drip irrigation for containers: a beginner setup

    If you go away for more than three days in summer, your containers need a watering system. A basic drip kit costs under EUR 100 and takes an afternoon to install.

    What you need

    • A tap timer (battery-powered is fine).
    • A pressure reducer and filter.
    • 13 mm supply pipe along the base of the wall.
    • 4 mm micro tubing with one adjustable dripper per pot (two for large ones).

    Settings

    Start with 10 minutes at 6:00 every morning and adjust after a week by checking how damp the soil is 5 cm down.

    No tap on the balcony? A gravity-fed system from a 50-litre water barrel works for a week’s holiday.

  • How much weight can my balcony hold?

    It is the question we get asked most, and the honest answer is: it depends on the building, and you should check.

    Austrian standards typically design residential balconies for an imposed load of around 400 kg per square metre, but older buildings and cantilevered balconies can be lower. Your property manager or the building plans will have the figure.

    What things weigh

    • Wet potting compost: roughly 1 kg per litre.
    • A 60-litre planter, filled and watered: 70 to 80 kg.
    • A 120 cm raised trough: easily 200 kg.

    How to reduce weight

    Use lightweight fibreglass or plastic containers, fill the bottom third with expanded clay instead of soil (only for deep pots), and put the heaviest items near the wall, not at the edge.

  • The 12 best plants for a hot south-facing balcony

    A south-facing balcony in Graz can hit 45°C at pot level in July. Most bedding plants from the supermarket give up by mid-summer. These twelve do not.

    Herbs that love the heat

    Rosemary, thyme, oregano and sage all come from Mediterranean hillsides and want exactly what a hot balcony offers: sun, wind and soil that dries out between waterings. Plant them in a gritty mix with a third horticultural grit.

    Flowering perennials

    • Lavender (Lavandula angustifolia ‘Hidcote’): compact, hardy, loved by bees.
    • Gaura: flowers from June to the first frost and moves beautifully in wind.
    • Catmint (Nepeta ‘Walker’s Low’): cut back after the first flush for a second one.
    • Sedum and sempervivum: near-indestructible, good for shallow troughs.

    Grasses

    Stipa tenuissima and Pennisetum give movement and screening without the weight of shrubs.

    The one rule

    Use the biggest containers your balcony can safely carry. A 40-litre pot holds water three times longer than a 15-litre one, and the roots stay cooler.