Another plant that can be found in ordinary nature, as well as in the gardens of the city of St. Petersburg, is CORYDALIS solida. This is a perennial plant that is found in clearings and clearings, in sparse bushes, and in river valleys.

Corydalis prefers rich soils with limestone outcrops and forms clumps. Corydalis is a spring ephemeroid: it blooms with the appearance of thawed patches, blooms for only a few days, and soon seeds spill out of the fruits onto the ground; By June, the above-ground parts of the plant die off, leaving a spherical tuber in the ground. A closely related species, the intermediate corydalis (C. intermedia), is included in the Red Book of the Leningrad Region.