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The theory of massive gravity proposed by Bergshoeff, Hohm and Townsend isconsidered in the special case of the pure irreducibly fourth order quadraticLagrangian. It is shown that the asymptotically locally flat black holes ofthis theory can be consistently deformed to "black flowers" that are no longerspherically symmetric. Moreover, we construct radiating spacetimes settlingdown to these black flowers in the far future. The generic case can be shown tofit within a relaxed set of asymptotic conditions as compared to the ones ofgeneral relativity at null infinity, while the asymptotic symmetries remain thesame. Conserved charges as surface integrals at null infinity are constructedfollowing a covariant approach, and their algebra represents BMS$_{3}$, butwithout central extensions. For solutions possessing an event horizon, wederive the first law of thermodynamics from these surface integrals.

Asymptotically locally flat spacetimes and dynamical black flowers in three dimensions