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. https://eutrema.co.uk/shop/fertiliser/liquid-gold-unique-complete-fertiliser/ 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
