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.
You can make contributions to a Roth IRA for a year at any time during the year or by the due date of your return for that year (not including extensions). You can make contributions for 2014 by the due date (not including extensions) for filing your 2014 tax return.