Starting a new garden on building rubble: the phases per year

Building rubble is not just soil. The contractor has dragged machines across it, buried rubbish, and compressed everything to stone hard. No earthworms, no bacteria, no life. But you need not despair: you can build a lush garden, step by step, and save money along the way by planning smartly.

The key is phasing. You do not start with flowers immediately. You start with saving the soil, laying drainage, planting trees, and only planting the lawn in year two. This article follows the approach season by season and shows you what you do yourself, where you hire help, and how you manage your budget without cutting corners on what matters.

Phase 1: Testing the soil (now, autumn-winter)

Before you plant anything, you want to know what you have. Many contractors leave rubbish buried in the ground "because it is good for drainage." Nonsense. Coarse rubble blocks water, fine rubble covers the soil, and both cause problems later.

Have a soil sample taken at a laboratory (about 35 to 60 euros). They measure pH, nitrogen, phosphorus, potassium, texture and contamination. Online you find the addresses per region. The report tells you exactly what to do. Is the pH 8.5 and do you want blue hydrangeas (Hydrangea macrophylla)? Then you know: skip them, that plant needs acidic soil. Is the compaction worse than 60 cm deep? Then only soil replacement or deep loosening with a rotavator helps.

While you wait for the report, walk the garden with a spade and take test holes. Can you dig easily 30 cm deep? Good sign. Does your spade hit stone? Note where. Is there water pooling? Note that too. This gives you a map that your architect or contractor can use.

Phase 2: Removing rubble and installing drainage (winter)

This is when serious work happens. A pickaxe alone will not do it. You need an excavator for half a day (200 to 400 euros, depending on access and disposal). The operator digs out the top 40 cm, separates the rubble and hauls it away. What remains is still compacted, but now without rubbish.

At the same time, you install drainage. Ground is wetter than you think. A gravel drain system for 5 x 8 metres (a standard garden) costs about 800 euros to install including pipes and outlets. This prevents you wading through mud each spring. If money is tight, prioritise: drainage first, lawn later.

After drainage you spread a layer of garden soil on the site: roughly 20 cm evenly (costs 30 to 50 euros per cubic metre, so for a 100 m2 garden easily 300 to 500 euros). It feels like a lot, but without soil you cannot start. Cover the whole garden, or at least the future borders.

Phase 3: Planting trees - the first-year advantage

This sounds early, but you plant trees in the bare season, so now, November through March. They grow for 30 years: each month of delay costs you growing time long term. Choose trees that do what you want: shade (oak Quercus robur, beech Fagus sylvatica, ash Fraxinus excelsior), colour (plum, maple, hawthorn), berries for birds (rowan, sweet cherry). Two to three medium-sized trees (8 to 10 metres at maturity) are enough for a standard garden.

Plant trees at full-grown distance from the house, at least 5 metres for light varieties, 8 to 10 for vigorous growers. Do not plant them under one another and not too close together. A tree in a stuffy corner grows lopsided.

Buy a tree of 12 to 15 cm trunk circumference (3 to 4 years old) locally, not online. The garden specialist knows what will grow at your place. Plant with support (bamboo or plastic tree stake). Water the first two years in dry spells gently.

Phase 4: Border planting - ground covers and bird-friendly (spring year 1)

After drainage and trees the seed is sown: the growing plan. Border planting goes in now, but not all at once. Start with hardworking, steadfast plants that do not mind compacted soil. Think Geranium, Epimedium, Heuchera, ornamental grasses and low shrubs (Buxus, Ilex crenata, Skimmia).

These plants work as groundcover. They suppress weeds, prevent rain from running off, and their roots begin to loosen the soil. Plant them in blocks of 3 to 5, not scattered. Unity gives a bigger effect. Not sure which combination suits your border? On gardenworld.app you see a preview with these plants in your own garden first.

Mulch everything thickly - 5 to 8 cm - with garden bark. This feels costly (50 to 150 euros for a standard garden), but it saves 10 hours of weeding per season and retains moisture in dry summers. After two years the lower layers rot into nourishing humus. Top it up each spring.

Phase 5: Lawn comes late - year two, spring

Many garden owners want a lawn immediately. Resist that urge. Grass on compacted ground gives bare patches, moss and weeds. After one year, when trees have established and borders are starting to fill, then is the moment. The lawn does not need to be perfect: it can be irregular, it can be healthy green, it does not need to be golf course standard.

Turf is faster than seed, especially on rubble. For 100 m2 you pay 400 to 600 euros for turf plus laying. It establishes within two weeks. Lay it on well-prepared ground: level, a bit of sand underneath, water well the first two weeks.

Do not mow immediately, wait until 8 cm height. Then gently: once every 10 days, mowing height 4 to 5 cm. No artificial fertiliser, not even "lawn food." That causes problems later.

Multi-year budgeting

These are rough figures for a standard garden (100 to 150 m2):

• Soil test: 50 euros
• Excavation and rubble removal: 300 euros
• Drainage: 800 euros
• Garden soil (20 cm, 100 m2): 400 euros
• Three trees (with planting): 500 euros
• Groundcover planting and mulch year 1: 800 euros
• Lawn year 2: 600 euros

Total: approximately 3,450 euros for two years of full preparation. That seems like a lot, but you have no failures, no weed nightmares, and after two years your garden is solid.

What you save

Many contractors want to do everything at once: "Complete garden remake, six weeks work, 8,000 euros." Such a layout fails on rubble soil. Plants die, drainage does not work, lawn becomes moss.

By spacing it out yourself and fixing the ground first, you save rework later. Once you have killed hydrangeas and seeded the lawn it costs 1,000 euros quickly. So make sure the ground is right and everything grows.

Step by step

Step 1: Analysis (autumn year 1)

Take soil sample, measure site, locate rubble, check water table.

Step 2: Heavy work (winter year 1)

Excavator, rubble off, drainage in, soil on, level.

Step 3: Trees (November to March year 1)

Choose three trees, plant, water first two winters.

Step 4: Groundcover (March to May year 1)

Groundcovers, ornamental grasses, low shrubs, mulch everything.

Step 5: Lawn (March year 2)

Lay turf, water intensively two weeks, start mowing gently.

Step 6: Filling in (summer year 2 onward)

Add plants where gaps remain, stake trees if needed, enjoy.

Frequently asked questions

Can I plant heavy plants straight away, like roses or fruit trees?

No. Roses (Rosa) hate compacted soil and will only get sick. Fruit trees on rubble soil give branch dieback and weak growth. Wait until year two, when the soil has settled.

How much garden soil needs to go on?

Minimum 20 cm spread evenly. For borders you can do 30 to 40 cm. For lawn 20 cm is enough, as grass roots shallow.

Is drainage really necessary?

Yes, unless your garden sits on very steep terrain and water runs off naturally. On flat rubble ground, drainage is the difference between a muddy pit and a green garden.

Can you plant trees yourself or must you hire a company?

For one or two trees: yourself, if you are fit and have a strong spade. For three or more: have them planted. It costs 80 to 150 euros per tree, but they establish better and you spare your back.

See it in your own garden first

Unsure if your design works in your soil and light? Upload a photo of your new garden to gardenworld.app, see free a preview of how trees and borders will look on your site. The full design with complete plant list and cubic metres costs 7.99 euros, once, no subscription. You see it before you pick up a spade.