Tanaman tapak dara berkhasiat sebagai anti kanker (antineoplastik), menenangkan hati, peluru kencing (diuretik) menurunkan tekanan darah (hipotensif), penenang (sedatif), menyejukkan darah, penghenti perdarahan (hemostatis), serta menghilangkan panas dan racun. Tujuannya untuk mempelajari respon pertumbuhan bibit tanaman tapak dara dengan pemberian beberapa konsentrasi giberelin (GA3) yang berbeda. Keragaman pertumbuhan tanaman bisa disebabkan oleh faktor genetik, lingkungan dan hormon. Salah satu zat pengatur tumbuh yang sering digunakan adalah giberelin (GA3). Penelitian dilakukan pada bulan 19 Maret sampai 19 April 2016. Metode penelitian ini menggunakan Rancangan Acak Lengkap (RAL), A1 = 0 ppm (kontrol), A2 = 20 ppm, A3 = 40 ppm, A4 = 60 ppm, A5 = 80 ppm, A6 = 100 ppm, A7 = 120 ppm perendaman benih dalam giberelin (GA3) selama 2 jam. Hasil penelitian menunjukkan pemberian giberelin memberikan respon berbeda nyata pada perlakuan 120 ppm terhadap parameter tinggi tanaman dan panjang ruas batang tetapi tidak berpengaruh nyata terhadap parameter jumlah daun, luas daun, jumlah ruas batang, diameter pangkal batang, akar terpanjang, berat kering akar, berat kering batang, berat kering daun dan berat kering total. Kata Kunci : Tapak Dara (Catharantus roseus (L) G. Don), Giberelin (GA3), Konsentrasi

Vinca plants useful as anti-cancer (antineoplastic), calms the heart, bullet urine (diuretic) lowers blood pressure (hypotensive), tranquilizers (sedatives), cool blood, stop bleeding (hemostatic), and eliminate heat and toxins. The goal is to study the growth of crop seeds vinca by giving some concentration gibberellin (GA3) are different. The diversity of plant growth can be caused by genetic factors, environmental and hormonal. One plant growth regulator that is often used is gibberellin (GA3). The study was conducted in March 19 to 19 April 2016. This research method using a completely randomized design (CRD), A1 = 0 ppm (control), A2 = 20 ppm, A3 = 40 ppm, = 60 ppm A4, A5 = 80 ppm, A6 = 100 ppm, A7 = 120 ppm soaking the seeds in gibberellin (GA3) for 2 hours. The results showed Award giberelin respond significantly different at the 120 ppm treatment parameters plant height and length of stem segments but did not affect the parameters number of leaves , leaf area , number of stem segments , stem diameter , the longest root , root dry weight , stem dry weight , leaf dry weight and total dry weight . Keywords: Vinca (Catharantus roseus (L) G. Don), Gibberellins (GA3), Concentration.

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