Due to their design, not all plants are suitable for cultivation in aquaponics and hydroponic systems. Here is an, always incomplete, overview of suitable plants.

Here you can find empirical values ​​on pH and EC values ​​for plants, herbs and vegetables.

The division between fruits, vegetables and herbs is not a biological one. It also varies from culture to culture.  

Fruits and vegetables are not generic terms for specific plant species. A clear definition is difficult. Could you say that fruit is sweet and vegetables are not? This is almost always true, but carrots, for example, can also taste sweet and you can make juice out of them. They do have a significantly lower sugar content than apples or oranges, but that's not really a satisfactory criterion. Because then you would have to set a certain sugar content as a limit and say: everything above that is considered fruit, everything else is considered vegetables. That would then be a rather arbitrary quantitative criterion.

Mixed definition: decision on a case-by-case basis.
In fact, we probably use a mixed definition in our heads. We have several criteria at hand and if several criteria contradict each other, we intuitively weigh them up and decide on a case-by-case basis what fits best. So: Asparagus is perennial, but it is not sweet and we don't eat the fruit, but rather the shoots - so we count it as a vegetable. Rhubarb is also perennial, we eat the shoots and even cook it – but it is eaten sweet, so we mostly count it as fruit.

Parts of the article were taken from GÁBOR PAÁL. CC BY-NC-ND 4.0 .

Overview of successfully grown plants in hydroponics & aquaponics

Salad

Fruit vegetables

Soft fruit

Cabbage

Root & tuber vegetables

Herbs

Basics of Taxonomy

The species plays a key role here. A biological species is a group of natural populations that form a reproductive community and are reproductively isolated from other groups. The isolation mechanisms between the individual species are biological in nature, i.e. not based on external circumstances, but rather inherent in the living beings themselves. This definition is considered the optimal definition of a species because it is not arbitrary, "one could even go so far as to call it 'self-operational'" by "emphasizing the criterion of reproductive isolation from other populations."

Since the biological species concept cannot be applied to all life forms (generation times too long, sexual reproduction unknown, parthenogenesis), there are other species definitions such as the morphological species (the most frequently used species definition), the phylogenetic species (due to phylogenetic relationships) or the ecological species in which morphologically identical or similar species are treated as different species if they occur geographically separately.

With the publication of  Systema Naturae  by Carl Linnaeus, binary (in zoology also binominal) nomenclature became established. The first part of the name refers to the genus, the second is the epithet for the species.

Methods

Traditional methods were based on morphological characteristics, such as body structure in animals or flower structure in plants. Later, findings from the fields of microscopy, physiology, biochemistry and genetics were incorporated into the taxonomic consideration. Recently, automated, computer-based identification systems are being tested that are intended to dramatically improve the accuracy and speed of a determination (see below).

Modern biological systematics is more profound. Phylogenetic relationships play a role in this. In the system, the different taxa are classified into a hierarchical family tree that is intended to reflect their evolutionary ancestry. The rules of cladistics are now considered the standard for classifying organisms, i.e. H. a taxon should be monophyletic.

Source: From File:Biological classification S Pengo.svg: Peter Halasz (User:Pengo) / *derived work TomCatX - File:Biological classification S Pengo.svg, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=15216142

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