Orchid Culture - Water Quality and Fertilizer
Orchid Culture - Watering, Water Quality and Fertilizer

Water Quality and Fertilizer for Orchids

Water Quality and Fertilizer for Orchids

Water Quality and Fertilizer for Orchids

Water Quality and Fertilizer for Orchids

The How and Why of Water, AOS
Watering and Fertilizing Your Orchids, Sue Bottom, SAOS
Watering Orchids During Each Season, Sue Bottom, SAOS
Choose Your Fertilizer Based on Water Quality, Sue Bottom, SAOS

Soluble Salts, Sue Bottom, SAOS What's New
Rain Collection Solution, Linda Stewart, SAOS What's New
Reverse Osmosis Water, James Arnold, JOS What's New

Calcium and Magnesium, Sue Bottom, SAOS
Calcium Deficiency in Cattleyas, Sue Bottom
Orchid Myths - Foliar Feeding Sue Bottom, SAOS
Orchid Myths - Urea Sue Bottom, SAOS
Magnesium or Phosphorus Promote Flowering? Dr. Yin-Tung Wang

Purely Organic Fertilizer, Sue Bottom, SAOS
What Do Orchids Eat?, Rick Lockwood
Orchid Supplement... Or Snake Oil?, Sue Bottom, SAOS

FirstRays.com Fertilizer Calculator
Are pH Checks Necessary, Harry McElroy, SAOS
Citric Acid for High Alkalinity Waters, Sue Bottom
Alkaline Well Water and Fertilizer, Sue Bottom, SAOS

Conversion Tables, Formulas and Guidelines, University of Georgia Extension
Applying Fertilizers and Chemicals, Sue Bottom

Understanding pH Management and Plant Nutrition

pH Management and Plant Nutrition
Bill Argo, Blackmore Co., Journal of the International Phalaenopsis Alliance

Part 1 Intro
Part 2 Water Quality
Part 3 Fertilizers
Part 4 Substrates
Part 5 Choosing the Best Fertilizers

Michigan State University Type Fertilizer

Peters Complete Guide to Fertilizer Selection

You can download a selection guide with lots of detailed information about their fertilizer. Consider adding supplemental magnesium in the form of Epsom salts with your fertilizer.

- For low to moderate alkalinity water or if you grow in a highly organic mix like bark or coconut, use a Cal Mag fertilizer (like Peters 17-3-17 Peat Lite Neutral Cal Mag or 15-5-15 Cal Mag fertilizer).
- For high alkalinity water from our shallow wells, use an acid generating fertilizer and Epsom salts (like 20-20-20 or 20-10-20 available from retail outlets; or Peters Excel 21-5-20 Multi Purpose from horticultural sources; Peters 18-8-17 Peat Lite High Mag Special would be ideal but is not available in Florida.)

Michigan State University Type Fertilizer

Michigan State University (MSU) Fertilizer
Without High Phosphorus - A New Fertilizer for Orchids

It is hard to find good fertilizer at the big box stores. The highly touted Michigan State Univrsity fertilizer is one with a lower middle (phosphorus) number and one that contains calcium, magnesium and micronutrients.

The opinions and recommendations published herein are those of the authors. The St. Augustine Orchid Society disclaims responsibility for any losses or damages that may be attributed to the use or misuse of any material or any opinion published in these articles and on the website. This website and the photographs, articles and content are protected by copyright and no part of them may be reproduced or re-used without the permission of the author.