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Passiflora Hardiness Zones See USA and European Hardiness Zones charts.   Viable temperatures This table covers the range of viable temperatures for Passiflora. P. incarnata & P. lutea, if dry enough, can survive 5° F/-15° C. Others like P. holosericea may survive well above 100° F/37.8° C.  We have had record temperatures of 38° C/100° F in UK in summer 2003, at which some Tacsonia species may die as the roots overheat. Also at high temperature many species and hybrids will stop flowering. See A-Z lists for temperature range for many Passiflora species & hybrids. ° F ° C  ° F ° C  ° F ° C  ° F ° C   5.0  -15.0 30.0   -1.1 55.0  12.8 80.0 26.7 6.0  -14.4 31.0  -0.6 56.0 13.3 81.0 27.2 7.0  -13.9 32.0 0.0 57.0 13.9 82.0 27.8 8.0  -13.3 33.0  0.6 58.0 14.4 83.0 28.3 9.0  -12.8 34.0  1.1 59.0  15.0 84.0 28.9 10.0  -12.2 35.0 1.7 60.0  15.6 85.0 29.4 11.0 -11.7 36.0 2.2 61.0 16.1 86.0 30.0 12.0  -11.1 37.0 2.8 62.0 16.7 87.0  30.6 13.0 -10.6 38.0  3.3 63.0 17.2 88.0  31.1 14.0  -10.0 39.0 3.9 64.0 17.8 89.0 31.7 15.0  -9.4 40.0 4.4 65.0 18.3 90.0 32.2 16.0  -8.9 41.0  5.0 66.0  18.9 91.0 32.8 17.0  -8.3 42.0  5.6 67.0 19.4 92.0  33.3 18.0  -7.8 43.0 6.1 68.0  20.0 93.0 33.9 19.0  -7.2 44.0 6.7 69.0 20.6 94.0 34.4 20.0  -6.7 45.0 7.2 70.0 21.1 95.0 35.0 21.0  -6.1 46.0  7.8 71.0 21.7 96.0 35.6 22.0  -5.6 47.0 8.3 72.0 22.2 97.0 36.1 23.0  -5.0 48.0 8.9 73.0  22.8 98.0 36.7 24.0 -4.4 49.0  9.4 74.0  23.3 99.0 37.2 25.0  -3.9 50.0 10.0 75.0  23.9 100.0 37.8 26.0 -3.3 51.0  10.6 76.0  24.4 . . 27.0  -2.8 52.0  11.1 77.0 25.0 . . 28.0  -2.2 53.0 11.7 78.0 25.6 . . 29.0  -1.7 54.0 12.2 79.0 26.1 . .