Dr. Russell Sharp explains how stomata—tiny pores on leaves controlled by guard cells—regulate gas exchange and water loss, why their opening matters for photosynthesis, and how stomatal conductance is measured and used to assess plant stress.
He also shares a simple, practical method for growers: the clear nail varnish peel technique to capture leaf impressions and view stomata under a microscope, plus notes on measuring limitations and applications for hydroponic systems.
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Chelsea Flower Show
Monstera
Philodendron
Autoflowers
Photoperiod
Autoflower
Alan Titchmarsh
Monty Don
Rachel De Thane
James Wong
Gardeners World
Horticulture Week
Gardeners Question Time
RHS Royal Horticultural Society
Garden Organic
Joe Swift
Soil Association 
Organic Farmers & Growers
Hampton Court Flower Show
 
 

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