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Cold susceptible [ Horticulture ]	Dictionary of botanic terminology - index of names
Synonym: Frost tender, Vulnerable to low temperatures,

In the horticultural sense describes a plant easily damaged or killed by even the lightest of winter frosts. Most evident would be tropical plants stretched to a cooler zone.

The term tender (cold susceptible) can be used to describe any plant that will suffer from cold temperatures, even a light frost. These plants generally come from tropical or sub-tropical regions and need special care when planted out of their native . This plants cannot survive outside during the winter when temperatures drop below 4°C, and must be overwintered inside before the first killing frost. In the north country this can be anytime from mid-September to October. Tender plants are suited for indoor and requires a minimum temperature of 10-15°C although some of they may tolerate occasional short exposure to below this level. So, it's also vital to wait until the last frost date for your area before to move them outdoors.

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Holdfast roots [ Botany ]
Dictionary of botanic terminology - index of names

Some species of climbing plants develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place.

Climbing plants, like the poison ivy (Toxicodendron radicans), Boston ivy (Parthenocissus tricuspidata), and trumpet creeper (Campsis radicans), develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place. Usually the Holdfast roots die at the end of the first season, but in some species they are perennial. In the tropics some of the large climbing plants have hold-fast roots by which they attach themselves, and long, cord-like roots that extend downward through the air and may lengthen and branch for several years until they strike the soil and become absorbent roots.

Major references and further lectures:
1) E. N. Transeau “General Botany” Discovery Publishing House, 1994