What we call weedsMonarch Butterflies call flowers. Especially milkweed, which monarchs need to survive. Monarch females drink from fragrant milkweed flowers and lay their tiny opalescent eggs on milkweed leaves. The eggs turn into black and orange and white monarch caterpillars. The caterpillars feed on milkweed leaves and form a chrysalis, the translucent pouch that turns into – a monarch butterfly!