Almost all Hoya seed species have excellent germination rates when, not long after collect, they are put in closed bags between layers of humid paper. On average these seeds will sprout between the third and the seventh day in the humid bag. After sprouting more days in the bag are needed before exposition to indirect light. Depending on the species the seedlings will more or less elongate. After 3 weeks in the bags some seedlings are still very small, others will have elongated by 1 cm.
The information below shows that when Hoya seeds are not grown shortly after collect their germination rate decreases fast, to the point that they may never germinate. The information from left to right reads:
1 : Hoya NAME
2 : date of COLLECT
3 : date of SOWING
4 : number of
days between Harvest and Sowing
5 : number of seeds SOWN
6 : number of seeds SPROUTED
7 :
% of germinated seeds
Last update : April 2015
HOYA AL5 2-Apr 4-Apr
2 21 21
100%
HOYA AL5 8-Dec 10-Dec
2 12 2
17%
HOYA AL5 11-Dec 15-Dec
4 14 14
0%
HOYA AMBON 12-Dec 28-Dec
16 25 0
0%
HOYA ANDALENSIS 12-Oct 30-Oct
18 80 14
18%
HOYA BORDENII 20-Nov 12-Dec
22 27 0
0%
HOYA BREVIALATA 20-Oct 7-Nov
17 45 6
13%
HOYA BURTONIAE 26-Dec 27-Dec
2 9 7
75%
HOYA CALLISTOPHYLLA 11-Oct 30-Oct
19 100 87
87%
HOYA CAMPHORIFOLIA 25-Dec 30-Dec
5 12 10
75%
HOYA CARNOSA PINK 5-Oct 15-Oct
10 40 27
67%
HOYA CHUNII 13-Nov 13-Dec
30 30 0
0%
HOYA CHUNII 3-Sep 19-Sep
16 12 5
42%
HOYA CHUNII 28-Sep 28-Sep
0 50 16
32%
HOYA CHUNII 10-Oct 30-Oct
20 110 13
12%
HOYA CLANDESTINA 24-Sep
26-Sep
2 10 10
100%
HOYA CLANDESTINA 15-Dec 8-Jan
23 50 13
26%
HOYA DENSIFOLIA DARK 13-Nov 22-Nov
9 35 0
0%
HOYA DEYKEI 27-Sep 28-Sep
1 50 50
100%
HOYA DEYKEI 20-Aug 22-Sep
32 11 0
0%
HOYA DEYKEI 19-Aug 7-Sep
18 50 43
86%
HOYA ERYTHRINA 3-Sep 17-Sep
14 12 5
42%
HOYA FINLAYSONII 28-Sep 28-Sep
0 20 20
100%
HOYA FINLAYSONII 10-Sep 30-Sep
20 20 0
0%
HOYA FINLAYSONII IV 20-Aug 22-Sep
32 50 0
0%
HOYA FINLAYSONII IV 18-Aug 26-Aug
8 10 10
100%
HOYA FINLAYSONII IV 21-Aug 27-Aug
6 10 10
100%
HOYA FINLAYSONII VI 20-Aug 22-Sep
32 50 2
4%
HOYA FINLAYSONII VI 18-Aug 26-Aug
8 10 10
100%
HOYA FINLAYSONII VI 21-Aug 27-Aug
6 10 9
90%
HOYA FINLAYSONII VII 21-Aug 22-Sep
31 50 0
0%
HOYA FITCHII 29-Aug 17-Sep
18 10 0
0%
HOYA HUESCHELIANA PINK 8 Jan 15 Jan
7 30 2 7 %
HOYA INCRASSATA 28-Sep 28-Sep
0 50 50
100%
HOYA INCRASSATA VAR. 16-Sep 6-Nov
50 100 51
51%
HOYA INCRASSATA VAR. 17-Sep 6-Nov
49 70 39
56%
HOYA INCRASSATA VAR. 17-Sep 6-Nov
49 80 44
55%
HOYA INCRASSATA MARG. VAR. 28-Sep 28-Sep
0 50 50
100%
HOYA INCRASSATA MARG. VAR. 20-Oct 7-Nov
17 75 13
17%
HOYA INCRASSATA MARG. VAR. 20-Oct 7-Nov
17 75 11
15%
HOYA KENTIANA 10-Oct 30-Oct
20 60 3
5%
HOYA LACUNOSA ESKIMO 25-Dec-27-Dec
2 13 0 0%
HOYA LACUNOSA X OBSCURA 30-Dec-3-Jan
12 12 12 100%
HOYA LACUNOSA SPLASH 25-Dec-27-Dec
2 15 15 100%
HOYA LATIFOLIA 18-Dec 27-Dec
9 100 18
18%
HOYA LOBBII BLACK II 28-May 8-Jun
10 30 10
33%
HOYA SP LATA ISKANDAR 16-Dec 12-Jan
26 25 0
0%
HOYA MAGNIFICA 12-Dec 28-Dec
16 13 0
0%
HOYA MEMORIA 13-Jan 27-Jan
14 17 0
0%
HOYA MERILLII AFF 25-Dec 8-Jan
13 30 0
0%
HOYA MINDORENSIS PHILIPPINA 11-Oct 14-Oct
3 57 52
96%
HOYA MINDORENSIS PINK 5-Jan 10-Jan
5 15 3
20%
HOYA MONTANA 30-Dec 30-Dec
0 12 9
75%
HOYA MULTIFLORA 13-Dec 22-Dec
9 50 0
0%
HOYA MULTIFLORA PHILIPPINA 11-Oct 14-Oct
3 61 52 0
85%
HOYA NEO EBUDICA 13-Dec 28-Dec
15 50 17
34%
HOYA NUMMULARIOIDES 8-Jan 15-Jan
7 12 12
100%
HOYA NOELLE 26-Nov 27-Nov
1 12 12
100%
HOYA OBSCURA 13-Dec 25-Dec
12 45 13
29%
HOYA ODORATA 6-Dec 18-Dec
12 45 0
0%
HOYA PACHYCLADA 15-Aug 17-Sep
32 12 10
83%
HOYA PACHYCLADA RED 12-Nov 7-Dec
25 12 0
0%
HOYA PADANGENSIS 8-Jan 15-Jan
7 12 0
0%
HOYA PALLILIMBA 20-Oct 7-Nov
17 20 0
0%
HOYA PARASITICA X PACHYCLADA 21-Aug 5-Sep
14 115 10
9%
HOYA PARASITICA X PACHYCLADA 10-Aug 15-Sep
35 50 0
0%
HOYA PARASITICA X PACHYCLADA 21-Aug 27-Aug
6 10 10
100%
HOYA PARASITICA X PACHYCLADA 12-Oct 30-Oct
18 120 78
65%
HOYA PARVIFOLIA 25-Nov 13-Dec
18 70 0
0%
HOYA PATELLA PINK 15-Jan 28-Jan
13 15 2 13
%
HOYA PSEUDOLITTORALIS 5-Dec 28-Dec
23 50 0
0%
HOYA QUINQUENERVIA 9-Oct 30-Oct
21 90 0
0%
HOYA RETUSA 8-Jan 15-Jan
7 12 0
0%
HOYA ROSARIOAE 13-Oct 30-Oct
17 50 17
34%
HOYA SULAWESII 30-Aug 17-Sep
17 20 0
0%
HOYA SULAWESII 21-Sep 26-Sep
5 50 12
24%
HOYA SULAWESII 10-Oct 19-Oct
9 10 10
100%
HOYA SULAWESII 12-Oct 30-Oct
18 70 16
23%
HOYA SULAWESII 9-Oct 30-Oct
21 70 4
6%
HOYA SULAWESII 13-Oct 30-Oct
17 70 31
44%
HOYA SULAWESII 29-Oct 7-Nov
8 30 18
60%
HOYA TOMATAENSIS 15-Dec 27-Dec
12 25 13
52%
HOYA TSANGII 24-Sep 26-Sep
2 40 40
100%
HOYA VIOLA 8-Jan 15-Jan
7 50 1
2%
HOYA VITELLINOIDES 23-Aug 22-Sep
29 50 0
0%