hollyhock
葵 refers specifically to the hollyhock plant, a tall flowering plant with large leaves. The meaning is concrete and botanical, without broad abstract extensions.
葵 combines the plant radical 艹 with 癸, which likely contributes the sound. The character was created to name the hollyhock plant.
The top grass radical 艹 shows it's a plant, and the bottom 癸 looks a bit like a tall stem with leaves. Picture a towering hollyhock growing from the ground.
For キ, imagine a key-shaped hollyhock stem unlocking a garden gate: key -> キ, and the plant is the hollyhock.
mallow (any plant of family Malvaceae)
sunflower (Helianthus annuus)
wasabi (Wasabia japonica); Japanese horseradish
common water hyacinth (Pontederia crassipes)
wild ginger trefoil family crest (of the Tokugawa clan); triple hollyhock family crest
Asarum caulescens (species of wild ginger)
cluster mallow (Malva verticillata)
geranium (Pelargonium inquinans)
cucumberleaf sunflower (Helianthus cucumerifolius)
Asarum nipponicum (species of wild ginger)
horseradish tree (Moringa oleifera); drumstick tree; moringa
wetland wasabi terrace
hollyhock
Senegal tea plant (Gymnocoronis spilanthoides); giant green hygro
Monochoria korsakowii (species of flowering plant)
Japanese wood poppy (Glaucidium palmatum)
hollyhock (Alcea rosea); common hollyhock
scarlet rosemallow (Hibiscus coccineus)
hollyhock (Althaea rosea)
wild ginger trefoil family crest (of the Tokugawa clan); triple hollyhock family crest