The most qualitative inspection is the star trial.This involves planting several varieties from a specific genus or species.The performance of the plants is assessed for several years.Plants can be rated with stars, with three stars being the highest rating. 3 Star plants get mentioned in the yearly catalogue Dendroflora.
However, some get an “o”, which means that the breed in question can disappear from culture without causing a narrowing in the assortment.
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