At Whittemore, quality isn’t just a standard — it’s our tradition. Since our roots in 1919, we’ve been dedicated to producing perlite and vermiculite that growers can trust. From the earliest perlite furnaces in the U.S. to today’s custom blending lines, we’ve built a reputation for clean, consistent products that perform the same way every time. Because in horticulture, consistency means confidence — and confidence is how stronger plants grow.