Incorporating a liquid seaweed extract into your orchid nutrition programme might be the one change that takes your plants from good to great.
Commercial and hobby orchid growers often report one or more the following improvements to their plants derived from the regular application of a seaweed concentrate:
Seaweed is a marine plant or algae that grows in the ocean, rivers, lakes and other water bodies. Seaweed is constantly bathed in a soup of minerals and nutrients. Many of these minerals and compounds in the water are absorbed by the seaweed and provide a foundation for some of its amazing nutrient and plant growth-promoting properties.
Eighty-four of the earth's basic elements have been identified in seawater as either macro or trace mineral ions.
There are many elements and compounds found in seaweed that support plant growth, reproduction (flowering or fruiting) and health. Some of these include macro and micronutrients, proteins, vitamins, auxins, cytokinins, gibberellins, abscisic acid (ABA), carbohydrates, lipids, chelating agents plus many more.
How seaweed works is difficult to define. It is my opinion that it is the synergistic effect of the bio-available nutrients, organic compounds and the plant growth hormones that send signals throughout the whole plant to stimulate biological and physiological responses in plants.
We also know that seaweed feeds the biology in and around the root zone and creates a healthy environment for root growth, improving soil structure and convert nutrient into a form that plants can absorb.
Seaweed contains many hormones and other growth-promoting compounds.
The 3 most common groups hormones we find in seaweed are:
There are over 70 minerals in seaweed all present in micro or trace quantities. They are present in proportions which are suitable for plants. The fertilisers we use, which are made from various chemical compounds only contain a handful of the nutrients required. It, therefore, makes sense to include seaweed concentrate with your fertilisation programme to supply the missing nutrients.
Combined with a quality fertilizer, seaweed concentrate will provide almost all the nutrients required to support plant health, growth and flowering (reproduction).
Orchids or any plant for that matter cant absorb organic nutrients directly from the seaweed. In order for the nutrients to be made available to the plant, microbes need to breakdown organic matter and release inorganic compounds for the roots to absorb.
Seaweed acts as a food for microbes and they will flourish and get to work on the seaweed, releasing beneficial nutrients and compounds for the roots to absorb.
There are a whole lot of benefits to derive from having beneficial microbiology being active in the root zone and potting medium which I will not discuss in this article.
The micronutrients through their involvement in enzyme processes are part of a plant’s nutrients profile, regulating growth and development.
Enzymatic reactions are dependent upon the presence of certain micronutrients, which serve as catalysts. The micronutrients (Iron, Copper, Zinc, Magnesium, Boron, Manganese and Cobalt) serve as catalysts which activate the enzymes. Even though plants only require small amounts of these micronutrients, they are just as essential as NPK (Nitrogen, Phosphorus, Potassium) and in some cases even more. A lack of one of the above trace elements can upset the balance of one or more enzyme systems.
Although the yield of the crop may not suffer because of a trace element deficiency, the quality can be adversely affected.
The deficiency of one trace mineral may not always be corrected by the simple addition of this micronutrient. The perceived lack of one trace element may be attributed to an excess of another. An excessive amount of iron will often display symptoms associated with a manganese and phosphorus deficiency. Excess copper and zinc reduce iron’s availability. On grasslands, an excess of molybdenum produces a copper deficiency. It is therefore deemed prudent and sensible to provide a balanced micronutrient package, such as seaweed, rather than a single element.
The fertilisers we use only contain a handful of micro-nutrients. Including a monthly application of seaweed is a great way of supplying all the micronutrients required to optimise plant growth and health.
The general recommendation for orchids is to apply a seaweed solution once a month. The reason for this is that seaweed contains growth hormones and frequent application can overstimulate cell-reproduction and cause flower and growth abnormalities.
If this does occur abstain from using seaweed for a couple of months. The orchid will revert to growing normally again. This does not cause permanent damage to the plant.
I encourage you to experiment and find what application method, rate and frequency works for your growing practices. Remember compared to other plants orchids grow slowly and it may take a bit of time to see the results in your orchids.
Not all seaweeds are created equal. Manufacturing and extraction processes affect the quality of the seaweed concentrate. Some seaweed products are a by-product of a manufacturing process and lack some of the vital ingredients.
We use Ocean Organics Seaweed Soil Concentrate and Ocean Organics Seaweed Foliar Concentrate on our orchids and house plants. Ocean Organics liquid seaweed products are manufactured by AgriSea New Zealand Ltd.
The New Zealand native seaweed species (ecklonia radiata) is batch-brewed with specially selected essential herbs for up to 90 days. The natural brewing process eliminates the use of processing with heat, chemicals, freezing or dehydration that might ‘denature’ the sensitive nutrient balance. The brewing process allows the natural growth stimulants and micro-nutrients to be released in an active form to enhance soil and plant health.
AgriSea NZ Ltd has been brewing quality products since 1996 and are a multi-award winning sustainable New Zealand company, family-owned and operated.
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Please recognize that seaweed is not a fertiliser as defined by classical science but rather it is to be considered as a growth enhancer or as a plant growth stimulant. Just like we take vitamins to improve our health and wellbeing, using seaweed as a drench or as a foliar spray helps improve or stimulate plant growth, reproduction and health.
Used alone, it does not contain sufficient quantities of nutrients to support plant growth and health.
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