Putin arrived in a vehicle carrying a bouquet of flowers and accompanied, local media said, by a troupe of Cossack singers booked to serenade the newlyweds.
Earlier on Saturday, Putin attended the wedding of Austria's Foreign Minister Karin Kneissl in the small town of Gamlitz.
Putin spent around an hour at the wedding and gave the newlyweds a cold press oil machine and a landscape painting depicting "where the groom hails from" as a present, according to Kremlin spokesman Dmitry Peskov.
The two sides have sparred in recent years over Russia's annexation of Crimea, its support for separatists in eastern Ukraine, for Syrian dictator Bashar Assad as he executes a brutal military campaign, over charges that Moscow interfered in the last United States presidential election, and, most recently, over British allegations that the Kremlin tried to kill former spy Sergei Skripal, who now lives in the UK.
There have been no reports that Ms Kneissl - a polyglot Middle East expert without political affiliation - has a particularly close friendship with Mr Putin.
"It was a nice trip", Putin said ahead of the talks with Merkel.
Merkel and Putin last met in the southern Russian city of Sochi four months ago for talks that focused on the Ukraine crisis as construction began for an expansion of a natural gas pipeline directly from Russia to Germany.
Standing beside Mr Putin outside Meseberg castle, Ms Merkel said she would also raise human rights issues and bilateral relations.
'I am of the opinion that controversial issues can only be addressed in dialogue and through dialogue, ' she said.
"It's important to help those areas that the refugees can return to", said Putin, whose decision for Russian Federation to military intervene in Syria's conflict tilted the odds in favour of Syrian President Bashar al-Assad.
Germany imports 55 billion cubic meters of gas, 70 per cent of its needs, from Russian Federation and the new pipeline would double that.