--- product_id: 736934405 title: "203 - Concentrate Pouch - 1.25 fl oz (37 mL) makes up to 32 fl oz (Pack of 5)" brand: "sierra natural science" price: "£45.07" currency: GBP in_stock: true reviews_count: 8 url: https://www.desertcart.co.uk/products/736934405-203-concentrate-pouch-1-25-fl-oz-37-ml-makes store_origin: GB region: United Kingdom --- # 100% pure botanical extracts Concentrate makes up to 32 fl oz 0-Day REI, safe for kids & pets 203 - Concentrate Pouch - 1.25 fl oz (37 mL) makes up to 32 fl oz (Pack of 5) **Brand:** sierra natural science **Price:** £45.07 **Availability:** ✅ In Stock ## Summary > 🌱 Protect your plants naturally with zero wait time! ## Quick Answers - **What is this?** 203 - Concentrate Pouch - 1.25 fl oz (37 mL) makes up to 32 fl oz (Pack of 5) by sierra natural science - **How much does it cost?** £45.07 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/736934405-203-concentrate-pouch-1-25-fl-oz-37-ml-makes) ## Best For - sierra natural science enthusiasts ## Why This Product - Trusted sierra natural science brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Versatile Use:** Effective on a wide variety of plants, fruits, and vegetables - • **Safe & Eco-Friendly:** EPA exempt, biodegradable, safe around children & pets - • **Powerful Pest Defense:** Dehydrates & kills root and stalk pests fast - • **Fungus & Algae Fighter:** Attacks fungus and algae to starve pests - • **Ultra-Concentrated Formula:** 1.25 fl oz makes up to 32 fl oz solution ## Overview Sierra Natural Science 203 Concentrate is a potent, 100% botanical pest and fungus control solution that dehydrates pests and attacks algae, making it ideal for healthy plant growth. This 1.25 fl oz concentrate yields up to 32 fl oz of ready-to-use spray, is EPA exempt under FIFRA 25(b), safe for children and pets, and can be applied up to harvest with zero re-entry interval. ## Description High moisture levels in soils and around pots encourage the development of fungus gnats, shore flies and other pests. When this occurs, plants will be stunted with reduced growth and leaf drop. 203 has active ingredients that cause pests to dehydrate and die while also, attacking fungus and algae, reducing the food source for pests. 203 is made up of 100% pure rosemary & clove botanical extracts highly water soluble. We process raw certified organic botanicals and herbs in-house, ensuring oils and terpenes have a consistent potency across all of our products. The botanical extracts are all food grade GRAS (generally recognized as safe when used as directed) materials, that are fully biodegradable, and not toxic to animals. It is exempt from EPA registration under minimum risk pesticide exempted under FIFRA section 25(b). It can be used on a wide variety of plants, fruits, and vegetables. ## Features - Dehydrates & kills pests and attacks fungus & algae - Fights against insects that feed on your plants roots & stalks - Can be used up to harvest (0-Day REI) - EPA Exempt Fifra 25 (b) - Safe around children & pets when used as directed ## Product Details - **Item Form:** Oil - **Item Weight:** 6.25 Ounces - **Liquid Volume:** 6.25 Fluid Ounces - **Active Ingredients:** Clove Oil, Rosemary - **Brand:** Sierra Natural Science ## Images ![203 - Concentrate Pouch - 1.25 fl oz (37 mL) makes up to 32 fl oz (Pack of 5) - Image 1](https://m.media-amazon.com/images/I/6139Jj1HEpL.jpg) ![203 - Concentrate Pouch - 1.25 fl oz (37 mL) makes up to 32 fl oz (Pack of 5) - Image 2](https://m.media-amazon.com/images/I/614WufJLgbL.jpg) ![203 - Concentrate Pouch - 1.25 fl oz (37 mL) makes up to 32 fl oz (Pack of 5) - Image 3](https://m.media-amazon.com/images/I/61HS4hVUIqL.jpg) ## Available Options This product comes in different **Size, Number Of Items** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Keeping my indoor houseplant collection in great health. *by A***A on January 20, 2024* I use it as a preventative measure. It helps me to save my plants from any above-ground pests (when used as a foliar spray) and in-ground, too (soil drench). I add a small amount with every other watering. Works for plants in leca. ### ⭐⭐⭐⭐⭐ IPM Program *by L***N on September 3, 2023* Wonderful product for commercial and home growers. This is my go too product to keep my garden and plants safe from pests. ### ⭐⭐⭐⭐ White Fly Killer *by B***N on March 9, 2020* I used this product on a citrus tree planted in a very large pot. The year before last I had basketfulls of tangerines and this past year I had none due to a serious white fly infestation. I tried the water blast method because I did not want to use any chemicals but when I realized the tree was going to die if I didn't do something I went on line and did some research. My tree is now sprouting new beautiful green tender leaves and hopefully I will not have the white fly infestation I have had in the past. I will update as time passes. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/736934405-203-concentrate-pouch-1-25-fl-oz-37-ml-makes](https://www.desertcart.co.uk/products/736934405-203-concentrate-pouch-1-25-fl-oz-37-ml-makes) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-11*