Janet Baraclough.. wrote:

Remember, butterflies don't just look for their own food plants. They
also look for (very specific) plants to lay their eggs on.

Monarch butterflies lay the eggs on a suitable food plant for the
caterpillars, milkweed. Most often monarch butterfly eggs are laid on
the underside of milkweed leaves, usually on fresh new leaves near the
top. However, eggs can be laid on milkweed flowers, stems, and pods.
Usually only one egg is laid on each plant. Sometimes if a monarch
cannot find enough milkweed, it will lay many eggs on one plant.
Monarchs are caterpillars for a couple of weeks. They spend that time
eating milkweed leaves. So that the plants will look better, plant more
of them so that there are fewer eggs per plant.

The adult butterflies live on the nectar of flowers. They don't eat
leaves.

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