In the Philippines, climatic unpredictability has been one of the main factors causing fluctuations in forage production; as a result, an efficient feed preservation strategy must be used. This study assessed the effect of various levels of L. plantarum as Napier silage inoculant on sheep's feed intake and growth performance. Using a Completely Randomized Design (CRD) set-up, a total of thirty (30) growing female sheep were randomly distributed to five (5) treatments and replicated six (6) times with one (1) animal per replication. The treatments were: Lp0 (control), Lp1 (Napier silage+1% L. plantarum), Lp2 (Napier silage+2% L. plantarum), Lp3 (Napier silage+3 % L. plantarum) and Lp4 (Napier silage+4% L. plantarum). Despite insignificant differences (p>0.05) in treatments on feed intake, a slight improvement was shown in the total feed intake of 3% L. plantarum. A slight reduction (p>0.05) of dry matter, organic matter, and crude protein intakes was observed in silages with 1% and 2% L. plantarum. A significant decrease (p<0.05) in NDFI was observed when the level of L. plantarum added increased. The most significant (p<0.05) increase in the growth rate and feed conversion efficiency was observed at the 2% level of L. plantarum. The results showed that incorporating L. plantarum at 2% different level improved the overall growth performance of sheep.