The National Botanic Garden of Wales is to receive up to £1.9m extra public money to pay off its debt.
Deputy First Minister Ieuan Wyn Jones said it was a one-off grant to put the £43m garden on a sound financial footing to attract private investment.
The money it receives each year from the assembly government will rise from £150,000 to up to £550,000.
Managers of the garden at Llanarthne in Carmarthenshire welcomed it as a "monumental milestone".
Two months ago, it emerged that garden managers were in talks with the assembly government to remove the debt and increase its annual grant.
Revealing the outcome of those talks, Mr Jones told AMs that the garden had met all the recovery targets it had been set.
Carmarthenshire County Council also announced that it would convert an existing £1.35m loan into a grant and provide a further package of financial support to the garden, with funding matched by the assembly government
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