Script runs if only one argument is true, and only the first part works. Thoughts?

I'm trying to make it so two different types of grass spawn at different times of day.

local grassTime = game.Lighting:GetMinutesAfterMidnight()

local sunGrass = game.ServerStorage.SunGrass
local moonGrass = game.ServerStorage.MoonGrass

local function spawnSunGrass()
	local sunCopy = sunGrass:Clone()
	sunCopy.Parent = game.Workspace.SunGrass
	local xPos = math.random(-3500, 3500)/100
	local zPos = math.random(-3500, 3500)/100
	sunCopy.Position = Vector3.new(xPos, 1, zPos)
end

local function spawnMoonGrass()
	local moonCopy = moonGrass:Clone()
	moonCopy.Parent = game.Workspace.MoonGrass
	local xPos = math.random(-3500, 3500)/100
	local zPos = math.random(-3500, 3500)/100
	moonCopy.Position = Vector3.new(xPos, 1, zPos)
end

--Problems start here.
while true do
	grassMath = math.random(1, 50)
	if grassMath == 1 and grassTime >= 480 and grassTime <= 1320 then
		spawnSunGrass()
		wait()
	end
	
	if grassMath == 2 and grassTime <= 480 and grassTime >= 1320 then
		spawnMoonGrass()
		wait()
	end
end

I've tried doing an if statement for each thing, one for grassMath and two for grassTime. I get all sorts of different results by changing bits and pieces, and have no clue where it's going wrong.

Do you mean that this part doesn't work?

if grassMath == 2 and grassTime <= 480 and grassTime >= 1320 then
	spawnMoonGrass()
	wait()
end

If so, it might be because grassTime can't be less than or equal to 480 and greater than or equal to 1320 at the same time. If you want it to spawn if grassTime is less than or equal to 480 or when grassTime is greater than or equal to 1320, I would use this code:

if grassMath == 2 and grassTime <= 480 then
	spawnMoonGrass()
	wait()
elseif grassMath == 2 and grassTime >= 1320 then
	spawnMoonGrass()
	wait()
end

or

if grassMath == 2 then
	if grassTime <= 480 or grassTime >= 1320 then
		spawnMoonGrass()
		wait()
	end
end

The problem was it never got past trying to spawn SunGrass, even if it wasn't within its set spawn time. I've figured out a different method that works, but if anyone has an answer using the stuff above I'd also like to know.

Here's how I fixed it:

local Lighting = game:GetService('Lighting')
local sunTimeStart = 8
local sunTimeEnd = 22
local moonTimeStart = 22
local moonTimeEnd = 8
local total = game.ReplicatedStorage.TotalGrass

--Functions are the same so won't include those.

Lighting:GetPropertyChangedSignal("ClockTime"):Connect(function()
	grassMath = math.random(1, 2500)
	wait()
	if grassMath == 1 then
		if Lighting.ClockTime >= sunTimeStart and Lighting.ClockTime <= sunTimeEnd then
			spawnSunGrass()
			total.Value += 1
		else
			wait()
		end
	else
		wait()
	end
		
	if grassMath == 2 and  Lighting.ClockTime <= moonTimeEnd then
		spawnMoonGrass()
		total.Value += 1
		wait()
	elseif grassMath == 2 and Lighting.ClockTime >= moonTimeStart then
		spawnMoonGrass()
		total.Value += 1
		wait()
	end
end)

I included the first solution you sent for fixing MoonGrass, thank you. :)