Company Tools Locations Team Harrells myHarrells PRODUCTS MARKETS SALES TEAM EDUCATION BLOG CONTACT Customized Horticulture solutions to keep your plants at their best, no matter the stress. Previous Next Your Harrell’s Horticulture Specialists are here to help you produce lush, vibrant, healthy plants. You can count on your year-round agronomic program to maintain the exceptional health and beauty of your plants with increased yield. Tools You Can Use Providing you peace of mind through agronomic tools and services. Let’s take the guesswork out of your plant health needs. POLYON® Custom-blended POLYON® controlled-release fertilizer solutions that deliver the ideal release rates and nutrients for your unique agronomic needs. Read more Not Affected by Moisture POLYON's® proprietary reactive layer coating (RLC) meters out nutrients via temperature-activated diffusion. This means predictable nutrition all year long. CustoGraph® Using our proprietary CustoGraph® software, we can find the exact prescription for your plant needs. MAX Rx Cannabis Program Your success is in the science. Let us create your custom nutrition program for MAXimum uptake. New Product Innovations Our on-staff research scientists test and analyze the latest industry-relevant products to make sure you get the best options available. myHarrell’s Access to your account information is available 24/7, from your computer, smartphone or tablet. myHarrell’s is available exclusively to registered Harrell’s customers. Go to myHarrell's CustoMIX Eliminate the guesswork and get real results! Our industry-leading CustoMix software allows us to build custom fertilizer blends that provide season-long nutrition for your plants. Online CEUs Earn CEU credits anytime, anywhere! Free online CEUs are available exclusively to Harrell’s customers who have a myHarrell's account. Browse courses Upcoming Events From tradeshows to customer lunches and seminars, we are always out and about providing educational opportunities to you. Find Your Sales Representative Please enter your zip code or enable GPS locator Search Popular Horticulture Products 12-6-8 Woody Orn. Mix, Poly 43 Custom-blended Harrell’s Profertilizer® starts with the latest advanced release technologies - some with POLYON® Controlled-Release Fertilizer -, followed by up to 175 ingredient options, double and triple-screened for the finest blends. Harrell's technicians sample every batch and supervise each bag of your order for quality control ensuring the best product. Consistent prill size, Harrell's Profertilizer® will spread evenly - with no streaking - for consistent growth all season long. Read more 16-6-11 + Micros 5-6 Mo. 5-6 month homogenous NPK and minors Polyon fertilizer. POLYON® Controlled-Release Fertilizers, with their trademarked GREEN color, give a professional all the things you want from a fertility program: consistent, predictable feeding that lasts for months with one application. Read more 23-3-8, 50 lb bags Custom-blended Harrell’s Profertilizer® starts with the latest advanced release technologies - some with POLYON® Controlled-Release Fertilizer -, followed by up to 175 ingredient options, double and triple-screened for the finest blends. Harrell's technicians sample every batch and supervise each bag of your order for quality control ensuring the best product. Consistent prill size, Harrell's Profertilizer® will spread evenly - with no streaking - for consistent growth all season long. Read more 15-6-12 Plus Micros 8-9 Month 8-9 month homogenous NPK and minors Polyon fertilizer. POLYON® Controlled-Release Fertilizers, with their trademarked GREEN color, give a professional all the things you want from a fertility program: consistent, predictable feeding that lasts for months with one application. Read more 15-6-11 + Micros 10-12 Mo. 10-12 month homogenous NPK and minors Polyon fert. POLYON® Controlled-Release Fertilizers, with their trademarked GREEN color, give a professional all the things you want from a fertility program: consistent, predictable feeding that lasts for months with one application. 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