I have been reading about a plant food which goes under the brand name Hortisil, described as a Silica based product and regarded as” the forgotten nutrient “. Its claims are Increased resistance to attack by fungi and insects, Decreased effects from powdery mildew, amongst others. A discussion on a Facebook post from about 4 years ago also stated it was giving good resistance to attacks by root aphid on Primulas. With further investigation I find the price is £85, far too expensive for an honorary Yorkshireman like myself .
Has anyone ever used this or could you recommend a more “ Yorkshire friendly “ silica based product?