gedeihen
to thrive
To develop well and vigorously; to grow and bloom. Used mainly for plants.
Die Tomaten gedeihen in diesem sonnigen Sommer prächtig.
The tomatoes are thriving beautifully in this sunny summer.

to thrive
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to thrive
To develop well and vigorously; to grow and bloom. Used mainly for plants.
Die Tomaten gedeihen in diesem sonnigen Sommer prächtig.
The tomatoes are thriving beautifully in this sunny summer.

'Gedeihen' (to thrive) is an inseparable verb. The prefix 'ge-' remains firmly attached to the verb stem in all sentence forms and tenses.
Ich hoffe, dass die neuen Pflanzen gut gedeihen.
I hope that the new plants thrive well.
The perfect tense of 'gedeihen' (to thrive) is always formed with the auxiliary verb 'sein' (to be), because it describes a change of state (growth). The form is 'ist gediehen' (has thrived).
Die Kräuter auf dem Balkon sind dieses Jahr prächtig gediehen.
The herbs on the balcony have thrived beautifully this year.
The verb 'gedeihen' (to thrive) belongs to elevated language. It sounds more formal and poetic than the everyday word 'wachsen' (to grow).
In dieser friedlichen Umgebung konnte die Kunst richtig gedeihen.
In this peaceful environment, art was able to truly thrive.
In connection with plants, 'gedeihen' (to thrive) is often combined with adverbs such as 'prächtig' (beautifully), 'gut' (well), or 'hervorragend' (excellently) to emphasize strong growth.
Meine Rosen gedeihen an diesem sonnigen Platz besonders gut.
My roses thrive especially well in this sunny spot.
The figurative meaning can be recognized from the context. When it is about abstract things like 'Ideen' (ideas), 'Unternehmen' (companies), 'Kultur' (culture), or 'Geschäfte' (business), literal growth is not meant.
Das kleine Unternehmen ist in den letzten Jahren gut gediehen.
The small company has thrived in recent years.
to care / concern / languish
'kümmern' and 'gedeihen' form a contrast here when it comes to growth. 'kümmern' describes that a plant remains weak and does not grow properly. 'gedeihen', on the other hand, means that a plant grows well, strongly, and healthily. Both words are especially well suited to plants. Put simply: a plant 'kümmert' when it is doing badly; it 'gedeiht' when the conditions are good.

Im warmen Gewächshaus gedeihen die Kräuter besonders gut.
The herbs thrive especially well in the warm greenhouse.
Die Tomaten kümmern, weil sie zu wenig Sonne bekommen.
The tomatoes are languishing because they are not getting enough sun.