The battle of temperature

=Cold=

Seed Selection
Cattail

Winter Melon

Melon-pult

Lily Pad

Planted
IV Cattails

VI Winter Melons

XII Melon-pults

VIII Lily Pads

Survived
VI Winter Melons

VI Melon-pults

IV Lily Pads

III Cattails

C Sun

Eaten
I Cattail

I Lily Pad

MMMMMDCL Sun

Strategy
Plant a column of Winter Melons, and then a column of Melon-pults. Whenever you have CCL sun, plant a Cattail.

=Hot=

Seed Selection
Gatling Pea

Torchwood

Repeater

Cattail

Lily Pad

Planted
VI Repeaters

VI Gatling Peas

VIII Cattails

X Lily Pads

Survived
VI Gatling Peas

VI Torchwoods

VIII Cattails

IV Lily Pads

CL Sun

Eaten
MMMMMDCXLV Sun

Strategy
Plant a column of Gatling Peas and then a column of Torchwoods. Plant a Cattail whenever you have CCL Sun.

=How to read roman numerals= I=1

II=2

III=3

IV=4

V=5

VI=6

VII=7

IX=9

X=10

XX=20

XL=40

L=50

XC=90

C=100

CD=400

D=500

CM=900

M=1,000

MMMM=4,000

So based on the facts, you should be able to work out this while covering the line below: MMMMMMMMMDCCXLIII

Answer:9,763