The temperature in your grow room is very important for the photosynthesis of your marijuana plants. For example, low temperatures reduces evaporation through the leaves. The result is that the suction force, which takes up nutrients via the roots, becomes smaller.
Yes, you can make contributions to your IRA, subject to the IRS annual contribution limits ($5,500 for the 2015 tax year, $6,500 if you're age 50 or older). But you must keep Roth IRA and traditional IRA money separate.
IRA contributions can be made for the previous year until tax filing day of the current year. You can contribute $5,000 ($6,000 if 50 or older) to a Traditional IRA or Roth IRA for 2012 until April 15th, 2013. This means that if you forgot to contribute to your IRA, you can still do so.