flat

So I read flat white is a cheap and effective upgrade to a room i have 5 gallons of flat latex but I noticed it says "moderate white " Will this be fine or being to technical

View image in gallery I have a 5 gallon potted plant. The temperatures dropped way below freezing for the first time last night. The plant looks bad. The leaves are completely flat, and others are flat and discolored. I know it was in it's flowering stage, and the plant seemed not to grow...