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I will try and help. Can you tell me more about what you are trying to do? Keep in mind, after the passage of proposition 64, you can now use, possess and grow marijuana at home (subject to certain restrictions). Under prop 64 you can use or possess up to an ounce. The law does no affect your rights under the Compassionate Use Act or the Medical Marijuana Program Act. Both require your use/possession/cultivation to be associated with your medical need. The average outdoor grown plant will produce, at minimum, a pound of bud. If you and three family members plant 24 plant (6 x 4) you are probably going to get a visit from law enforcement.
I hope this helps.
Are you talking about a medical marijuana card or a recommendation to use marijuana under proposition 215?
Under proposition 64, you (and each person) can have up to an ounce (that's a lot) and 6 indoor plants. As for outdoor plants, if you have 24 plants, you will probably gain the attention of law enforcement. The average outdoor plant will produce between 1 and 4 pounds of bud. If you smoked one marijuana cigarette every two hours 16 hours a day every day, you will consume about 3.5 pounds of MJ a year [this is the math the police will use]. So if you have 24 plants with 2 pounds each hanging on them (48 pounds) when you could reasonably use at most 14, then you may have a problem.
The short answer is that yes, if you have a card, then you can plant. The other question you asked involved an on-line card. These are not likely valid. You either need a 215 recommendation through a doctor (the better way to go) or a card issued through the state/county.