# Spring azure (Celastrina ladon) > Small pale-blue butterfly of eastern North America that appears in early spring and feeds on nectar and flower buds of shrubs and trees. Source: https://insectscanner.com/species/spring-azure/ (updated 2026-10-10) ## Is it dangerous? **Non-toxic.** Harmless to people. Does not sting or bite; handle gently if needed as wings and scales are delicate. **Pets:** Not dangerous. If a pet ingests a butterfly, it may vomit but no toxic effects are expected. ## Quick facts - Scientific name: Celastrina ladon - Order: Lepidoptera (Butterflies and moths) - Family: Lycaenidae (Gossamer-winged butterflies) - Size: 22-35 mm wingspan - Colours: Pale blue, White, Gray-brown - Habitat: Open woodlands, forest edges, scrub, gardens and hedgerows where host shrubs and early flowers occur - Range: Eastern and central North America: from southern Canada through the eastern United States (populations and exact boundaries vary with taxonomy) - Active: Early spring into early summer; in many areas one main spring brood with occasional later broods - Lifespan: Adults live about 1-3 weeks - Effect on plants: Minor herbivore - Pest: no ## Overview The spring azure is a small, delicate butterfly widely seen in eastern North America in early spring. Adults are short-lived pollinators that visit early-flowering shrubs, trees and woodland flowers. Larvae feed mainly on flower buds, blossoms and young fruit of a wide range of host plants, so this species often appears wherever its food plants grow. Taxonomy in the Celastrina group is complex and populations have been split and lumped by different authorities; Celastrina ladon is the name commonly used for the eastern spring-flying form. Behavior is typical of small blues: slow, fluttering flight close to vegetation and perching with wings closed when resting. ## How to identify it Adults are small butterflies with a wingspan about 22-35 mm. Uppersides of males are pale to medium blue with narrow dark margins; females may show a broader dark border or slight dark scaling. Undersides are pale gray to off-white with faint rows of small dark spots; the pattern is subtle compared with many other azures. Caterpillars are plump, green or greenish-yellow and usually have tiny fine hairs and a slightly tapered shape. The chrysalis is smooth, compact and often greenish or brownish, attached to stems or leaves. - Small size with a wingspan around 22-35 mm; much smaller than most white or sulphur butterflies - Upperside pale blue (males) with narrow dark margins; underside pale gray to off-white with faint small spots - Flight is low, quick and fluttering in early spring near host shrubs and woodland edges ## Lookalikes - **Summer azure** (Celastrina neglecta): Summer azure flies later in the season and may be nearly identical in appearance; separation often requires location, flight time and sometimes genitalia or genetics. - **Eastern tailed-blue** (Cupido comyntas): Tailed-blue has tiny tails on the hindwing and more distinct underside spotting; spring azure lacks tails. - **Holly blue** (Celastrina argiolus): Holly blue is a very similar Eurasian relative that does not occur in North America; a small blue in eastern North America is not this species. ## Life cycle - **Egg:** Single eggs are laid on flower buds, blossoms or young fruit of host plants in spring. - **Larva (caterpillar):** Green, plump caterpillars feed on flower buds and blossoms; they are often well camouflaged and may be tended by ants in some cases. - **Pupa (chrysalis):** Pupa is compact and attached to stems or leaves; pupation lasts days to weeks depending on temperature and brood. - **Adult (butterfly):** Adults emerge in spring, feed on nectar from early flowers, mate and lay eggs; they are active for a short period. ## Diet and predators - Young eat: Flower buds, blossoms and young fruit of various shrubs and small trees - Adults eat: Nectar from early-spring flowers such as willow catkins, wild plum, dandelions and other woodland and garden blossoms - Predators of the young: Wasps, spiders, ants and predatory insects - Predators of adults: Small insectivorous birds, spiders and predatory insects ## Effect on plants and gardens Larvae feed on flower buds, blossoms and young fruit of many shrubs and small trees (examples reported include dogwood, viburnum, wild cherry and various heath-family plants); damage is usually minor and not of economic concern. ## Where and when to find it Look along woodland edges, hedgerows and gardens near flowering shrubs; adults patrol low around blossoms and larvae are on flower buds and blossoms of host plants. - Best time: Early spring months in your region (often March-May), during warm, sunny parts of the day. - Tips: Walk slowly near shrub blossoms, watch low vegetation and take photos of the undersides for identification; approach carefully since adults are small and easily flushed. ## Fun facts - Spring azures often appear before many other butterflies, making them among the first pollinators of spring flowers. - The Celastrina group is notorious for cryptic species — what was once called a single 'azure' can turn out to be multiple similar species when studied with genetics. - Some larvae are attended by ants, which can protect them from predators in exchange for sugary secretions. ## Frequently asked questions ### Are spring azures poisonous or dangerous? No. They are harmless to people and pets and do not sting or bite. ### Do spring azures bite? No. Adults feed on nectar and do not bite; caterpillars do chew plant tissues but are not harmful to humans. ### Why is this butterfly in my yard? Your yard likely contains nectar sources and host shrubs (flowering dogwood, viburnum, cherry, blueberry-family plants or similar) that attract adults for nectar and egg-laying. ### How can I attract spring azures to my garden? Plant native early-flowering shrubs and nectar plants, provide sunny edges near shrubs and avoid pesticide use during spring when adults and larvae are active. ### How do I get rid of them if they are eating my flower buds? They rarely cause serious damage. If necessary, hand-remove a few caterpillars or prune a few infested buds. Chemical controls are generally unnecessary and harm beneficial insects. ### When will I see spring azures? Most often in early spring as shrubs begin to bloom; timing depends on local climate but is earlier than many other butterflies. --- More about this species: [iNaturalist](https://www.inaturalist.org/taxa/58556), [Wikipedia](https://en.wikipedia.org/wiki/Celastrina_ladon). Identify insects and spiders from a photo with the Insect Scanner iPhone app: https://apps.apple.com/app/id1543946563?pt=126685406&ct=web-markdown&mt=8 Identification from photos is never certain: don't handle insects you can't identify, and get medical advice for bites, stings or allergic reactions.