Ascophyllum nodosum · Guide
Seaweed fertiliser, properly explained
Seaweed fertiliser is a biostimulant, not a feed — its value is in the bioactive fraction, not its tiny NPK. Here's what it does, the three...
The Dr Forest blog · Est. Stockport · England · 2020
Soil science & growing guides, properly explained.
Evidence-led guides to organic fertiliser, feeding and soil science for UK growers. Deficiencies, ingredients, biostimulants and crop-by-crop feeding, with every claim checked against the original paper.
Ingredients guides.
chloride-free potash · Guide
Polyhalite vs sulphate of potash: which potash should you use?
Two of the cleanest potash options a UK gardener can buy. They look similar on the label, behave very differently in the soil, and answer different...
anaerobic fermentation · Guide
Bokashi bran: what it is, and how to use it to compost
Bokashi bran is rice or wheat bran inoculated with EM-1 microbes — sprinkled over kitchen scraps in a sealed bucket, it pickles food waste in two...
alfalfa · Guide
Alfalfa meal: the organic fertiliser with a built-in growth hormone
Dried, ground alfalfa is one of the most underrated organic amendments in UK gardening. It also contains triacontanol, a naturally occurring plant growth regulator identified in...
basalt · Guide
Volcanic rock dust: silicon and trace minerals | Dr Forest
Volcanic rock dust supplies silicon and over 60 trace minerals: the elements NPK fertilisers leave out. Here is the chef-and-soil-science case, plus the peer-reviewed evidence on...
boubly mine · Guide
What is polyhalite, and why does Wimbledon use it?
Polyhalite What is polyhalite, and why does Wimbledon use it? By Joe, Founder of Dr Forest · May 2026 In summer 2023, the Daily Telegraph ran...
The garden journal
Feeding schedules, soil science & 10% off your first order.
One letter a month on what to feed, when to feed it, and why it works. Written by Joe, for growers who want to understand their soil.