Penelitian ini bertujuan untuk mengetahui pengaruh perendaman stek pada berbagai konsentrasi GA3 terhadap produksi umbi kentang hitam (coleus tuberosus) penelitian ini menggunakan Rancangan Acak Kelompok non faktorial yaitu perendaman stek pada berbagai konsentrasi, P0 (tanpa perendaman), P1 (perendaman dengan konsentrasi 25 ppm), P2 (perendaman dengan konsentrasi 50 ppm), dan P3 (perendaman dengan konsentrasi 100 ppm). Penelitian ini dilaksanakan dikebun percobaan Universitas Trunojoyo Madura pada bulan Februari-Juni 2015. Hasil penelitian menunjukkan bahwa perendaman giberelin tidak berpengaruh nyata pada semua perlakuan baik pada panjang tanaman, jumlah cabang, jumlah bunga, jumlah umbi, bobot umbi, diameter umbi, volume umbi, berat akar dan berat batang dan daun. Kata kunci : coleus tuberosus, giberelin

This study aims to determine the effect of soaking cuttings in various concentrations of GA3 to the production of potato tuber black (Coleus tuberosus) This research used randomized block design non factorial is soaking cuttings in various concentrations, P0 (without soaking), P1 (soaking with a concentration of 25 ppm) , P2 (soaking with a concentration of 50 ppm), and P3 (soaking with a concentration of 100 ppm). The research was conducted in the garden experiment Trunojoyo University in February-June 2015. The results showed that immersion giberelin no real effect on all treatments either on the length of the plant, number of branches, number of flowers, the number of tubers, tuber weight, tuber diameter, volume bulbs, roots and the heavy weight of stems and leaves. Keywords: coleus tuberosus, giberelin

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