An illustration of the letter A and a potted plant.
Littaea geminiflora, or the Twin-Flowered Agave, showing the flower and the whole plant.
Aphelandra cristata is a flowering plant shown potted here because it is often used as a houseplant.
A healthy potted clover plant.
A potted clover plant, stunted as a result of a nitrogen deficiancy in the soil.
The Aechmea fulgens of coralberry is a bromeliad which is often used as a decorative plant.
A hydrangea used for an experiment.
Loasa Pentlandica is a flowering plant of the Loasaceae family used as an ornamental plant.
An illustration of the letter N and a potted plant.
An illustration of the letter O and a potted plant.
Cycas revoluta or sago cycad is known as the king sago palm but is not a palm; it is a cycad.
A wheat plant grown in a pot, stunted as a result of nitrogen deficiency in the soil.