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Motifs
花
According to the Chadō Textbook:
はぎ (Buschklee)
すすき (Chinaschilf)
葛(くず)
なでしこ / せきちく (Chinesische Nelke)
おみなえし (Goldbaldrian)
ふじばかま (Wasserdost, Wasserhanf)
ききょう (Ballonblume, Chinesische Glockenblume)
しゅうかいどう (Begonie, Schiefblatt)
ほととぎす (Japanische Krötenlilie)
みざまりんどう (Enzian)
しゅうめいぎく (Herbst-Anemone)
Issoan Tea also explains that there are 7 grasses of autumn (秋の七草, あき の なな くさ), often mentioned in Japanese poetry:
はぎ (Buschklee)

すすき (Schilf)
くず
なでしこ (Dianthus)
おみなえし (Baldrian)
ふじばかま (Wasserdost, hemp agrimony; Eupatorium fortunei)
あさがお (modern Japanese: ききょ, Prunkwinde, bellflower; Platycodon grandiflorum)