La. Civ. Code art. 1598
All legacies, whether particular, general, or universal, include the fruits and products attributable to the object of the legacy from the date of death, but the right of any legatee to distribution under this Article is subject to administration of the succession.
Nevertheless, the legatee of a specified amount of money is entitled to interest on it, at a reasonable rate, beginning one year after the testator's death, but the executor may, by contradictory proceedings with the legatee and upon good cause shown, obtain an extension of time for such interest to begin to accrue and for such other modification with regard to payment of interest as the court deems appropriate. If, however, the legacy is subject to a usufruct for life of a surviving spouse or is held in trust subject to an income interest for life, to or for the benefit of a surviving spouse, the spouse shall be entitled to interest on the money from the date of death at a reasonable rate.
La. C.C. § 1598