Organic Fertilisers

The Liquid "Teas" (Fast-Acting Feeds)

Liquid feeds are "quick wins" for hungry plants, like tomatoes, chillies, and brassicas.

Comfrey Tea (The "Potash Powerhouse")

Comfrey has deep taproots that mine potassium and phosphorus from deep in the subsoil.

  • Best for: Tomatoes, flowering plants, and fruit bushes.

  • The "Smelly" Method (High Volume): 1. Fill a bucket 3/4 full with chopped Comfrey leaves (use gloves—they are prickly!).

    2. Fill with water and weigh the leaves down with a brick.

    3. Cover with a lid (it will smell like a swamp) and leave for 3–4 weeks.

    4. Dilution: 1 part "tea" to 10 parts water.

  • The "Concentrate" Method (No Smell):

    1. Stuff a PVC pipe or an inverted 2L bottle with leaves.

    2. Let them rot without water. A black, thick liquid will drip out of the bottom.

    3. Dilution: 1 part concentrate to 20 parts water.

Nettle Tea (The "Nitrogen Boost")

Nettles are rich in nitrogen and iron, making them the perfect tonic for leafy greens.

  • Best for: Kale, spinach, leeks, and young seedlings.

  • Instruction: Follow the "Smelly Method" above using young nettles (before they go to seed).

  • Dilution: 1 part tea to 10 parts water.

Seaweed Fertilizer (The "Trace Mineral" Tonic)

If you live near the coast, seaweed is a goldmine of magnesium, iodine, and growth hormones.

  • Instruction: Collect washed-up seaweed (check local bylaws). Rinse off excess salt. Soak in a barrel of water for 2–3 months.

  • Dilution: 1 part liquid to 10 parts water. It acts as a bio-stimulant, making plants more resistant to UK frosts.

Green Manures (The Living Fertilizers)

These are "cover crops" sown when the ground is bare to protect the soil from being washed away by UK winter rains and to "fix" nutrients for the next crop.

Crimson Clover, Vetch, Phacelia, Rye, Mustard.

How to use them:

  1. Sow: Scatter seeds on bare soil and rake in lightly.

  2. Chop & Drop: Before the plants go to seed (or 4 weeks before you want to plant), strim or mow them down.

  3. Incorporate: Either lightly hoe the remains into the top 2 inches of soil or leave them on the surface as a "green mulch" and plant directly through them.

Soil Conditioners (Long-Term Fertility)

These don't just feed the plants; they build the "gut" of your garden.

Leaf Mould (The "Fungal Gold")

In the UK, we have an abundance of autumn leaves. While they aren't high in N-P-K, they are the best conditioner for soil structure.

How to make:

1. Rake up fallen leaves (Oak, Beech, and Hornbeam are best; avoid thick Sycamore/Chestnut).

2. Stuff them into black bin bags, poke a few holes for air, and moisten them.

3. Tuck them in a corner for 1–2 years.

4. Result: A crumbly, dark material that is the perfect home for beneficial fungi.

Wood Ash (The "Instant Potash")

If you have a wood-burning stove, your ash is a valuable resource.

  • Best for: Soft fruits (raspberries/currants) and garlic.

  • How to use: Sprinkle lightly around the base of plants in spring.

  • Warning: It is highly alkaline. Do not use it on "ericaceous" (acid-loving) plants like Blueberries or Rhododendrons.

Biochar (The "Carbon Sponge")

Biochar is charcoal made through "pyrolysis" (burning wood with limited oxygen).

  • How to make/use: Burn woody waste in a trench and douse with water before it turns to ash.

  • Crucial Step: You must "charge" biochar before use by soaking it in your Nettle or Comfrey tea for 2 weeks. If you put "raw" charcoal in the soil, it will actually suck nutrients out of your plants!

Nutrient Cheat Sheet

  • Nitrogen (Leaf Growth): Nettle Tea, Grass Clippings, Clover, Chicken Manure.

  • Phosphorus (Roots/Seeds): Comfrey, Bone Meal, Rock Phosphate.

  • Potassium (Fruit/Flower): Comfrey, Wood Ash, Seaweed, Banana Skins.

  • Calcium (Cell Strength): Crushed Eggshells (steeped in vinegar for faster release).