Cultivation
Deep, bed of rich substrate. Plenty of light and water on the soft, acid side. Tropical temperatures. It will grow well emerse or submerse. Propagate by adventitious plantlets which form on the inflorescence. A rather demanding species, now rarely seen.
The flowers open in the later morning hours only for about 2 hours. After this, it closes completely. E. horizontalis opens its flowers even unter water. The plant is self fertile.
Seed germination seems variable, but Rataj & Horemann report most success at higher temperatures (28 C).
Without flowers it can be confused with other species such as E. tunicatus, and rarely seems to be offered as the true species in the trade.
Read more about this topic: Echinodorus Horizontalis
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