A new period in the life of the Summer Garden begins during the reign of Nicholas I.

The garden receives a decorated border on the south side – the fence of L. I. Charlemagne. The side alleys of the garden are opened for horseback riding, new structures appear on the territory of the garden.

In 1826, on the site of the destroyed Grotto, the Coffee House was erected in the style of classicism according to the project of the architect Carl Rossi. The composition of the Grotto was guessed in its appearance, the foundation and walls of which were used by the architect.

According to the project of L. I. Charlemagne, in 1827, a one-story wooden pavilion of Mineralnye Vody was built, later called the “Tea House”.

A cast-iron fence along the border of the garden from the side of the Moika River was installed in 1826 and finally completed in 1829 according to the project of architect L. I. Charlemagne.
In 1830, from the side of the Fontanka and the Swan Canal, the Neva fence was supplemented with “fans” with spears, also made according to the project of L. I. Charlemagne.
In 1839, a vase of Elfdal porphyry was installed on a high pedestal in front of the Karpiev Pond – a gift from the Swedish King Charles John XIV to Nicholas I.
The vase took on the role of the lost dominant of the first quarter of the 18th century – the fountain in the Carp Pond, visually closing the central alley of the Second Summer Garden.

In 1855, a monument to I. A. Krylov designed by Pyotr Klodt was unveiled in the French parterre bosquet.
On the terrace of the Swan Canal, cast-iron vases designed by Carl Rossi were installed, originally created for the site near the Coffee House. The shape of the vases resembles ancient lamps.

All these structures became examples of Russian art and organically entered the ensemble of the Summer Garden.

In 1867, the composition of the Neva fence was changed by the construction of a chapel at the place where Dmitry Karakozov shot at Alexander II in 1866. During the construction of the chapel, the central gates of the fence were destroyed, which supported the central axis of the composition of the First Summer Garden.

Three quarters of a century later, in 1931, the chapel was dismantled and a new blind link of the fence was put in its place.

Historically formed at the beginning of the 18th century, the planning system of straight roads and sites did not change at the end of the 19th century, and the green walls of the trellises of the Summer Garden existed for another century. The last surviving trellis plantings are recorded on the 1940 inventory plan.