One of the followings:

Completed both The Shopping List and A Return to Shopping side-quests (during Part One)

OR

Purchased the cultivation handbook from the florist in the village market (during Part Two)

The achievement REQUIRES you to harvest a white flower or a white flower seed

The game has three basic flowers colours (Red, Gold, Blue) that can be purchased from the Grocery Vendor in Seafront

Getting White from these three basic colours (4 steps):
Step 1: RED + GOLD = PEACH
Step 2: GOLD + BLUE = INDIGO
Step 3: INDIGO + RED = PINK
Step 4: PEACH + PINK = WHITE (also called Lunar Tear)

ATTENTION: A flower must be surrounded by two flowers of different colour in order to obtain the highest chance of them successfully changing colour (Eg: Red must be surrounded by Gold)

The colour of the center flower and the surrounding flowers does not matter. They are interchangeable (Eg: To produce Peach, Red can be surrounded by Gold or Gold can be surrounded by Red) (Thanks LionOfComarre )

However, for simplicity sake, I will only provide instruction for one way of how flowers should surround each other (Eg; The procedure will only show Red surrounded by Gold to produce Peach)

1) DO NOT WATER ANY OF THE PLANTS. Watering will give more yield around (70-80% more seeds) . However, if you were to fail any of the steps (which i guarantee you will) you will just waste time. Thus, no watering is recommended

2) You can uncap the FPS to reduce the time needed to go through all of the steps. As most people have already know, FPS is tied to the game physics, the higher the FPS, the faster things move around. I did not encounter any bugs when I uncapped the FPS. HOWEVER, if you do, please comment down below and I will delete this ASAP

3) If you want the flowers and not the seeds, fast forwards by one day only

1. Go to Seafront and buy 9 Red, 6 Gold, and 6 Blue from the Grocery Vendor



2. Go back to your house and let's start planting



3. GETTING PEACH FLOWERS

Plant Red flowers in the following order:

RED EMPTY RED EMPTY RED
RED EMPTY RED EMPTY RED
RED EMPTY RED EMPTY RED

Keep a save file of with the garden in this arrangement (Save 1)

After you have made the save, plant the Gold flowers in the Empty Slots. Your garden should look like this

RED GOLD RED GOLD RED
RED GOLD RED GOLD RED
RED GOLD RED GOLD RED

Make a save this the garden in this arrangement (Save 2) (DO NOT override Save 1)

Forward the time on your PC by two days (NO need to exit your game)

Load Save 2

If you are successful, you will see some Peach coloured flowers on the ground

.
If you are unlucky and see no Peach flowers formed, load Save 1 and repeat the steps until you get your Peach flowers

This is what it looks like when you have failed

.





4. GETTING INDIGO FLOWERS

Plant Gold flowers in the following order:

GOLD EMPTY GOLD EMPTY GOLD
GOLD EMPTY GOLD EMPTY GOLD
GOLD EMPTY GOLD EMPTY GOLD

Keep a save file of with the garden in this arrangement (Save 1) (You can now override any saves from the previous step)

After you have made the save, plant the Blue flowers in the Empty Slots. Your garden should look like this

GOLD BLUE GOLD BLUE GOLD
GOLD BLUE GOLD BLUE GOLD
GOLD BLUE GOLD BLUE GOLD

Make a save this the garden in this arrangement (Save 2) (DO NOT override Save 1)

Forward the time on your PC by two days (NO need to exit your game)

Load Save 2

If you are successful, you will see some Indigo coloured flowers on the ground

.
If you are unlucky and see no Indigo flowers formed, load Save 1 and repeat the steps until you get your Indigo flowers






5. MULTIPLYING THE FLOWERS (INDIGO and PEACH)

By now you should have Indigo and Peach flowers. However, the quantity of them is not much so we are going to multiply them

Simply plant all of the Indigo and Peach seeds that you have.

Save

Forward the time on your PC by two days (NO need to exit your game)

Load the save and by now you should have at least 9 Indigo and 9 Peach (if not, repeat this step)

6. GETTING PINK FLOWERS

Plant Indigo flowers in the following order:

INDIGO EMPTY INDIGO EMPTY INDIGO
INDIGO EMPTY INDIGO EMPTY INDIGO
INDIGO EMPTY INDIGO EMPTY INDIGO

Keep a save file of with the garden in this arrangement (Save 1) (You can now override any saves from the previous step)

After you have made the save, plant the Red flowers in the Empty Slots. Your garden should look like this

INDIGO RED INDIGO RED INDIGO
INDIGO RED INDIGO RED INDIGO
INDIGO RED INDIGO RED INDIGO

Make a save this the garden in this arrangement (Save 2) (DO NOT override Save 1)

Forward the time on your PC by two days (NO need to exit your game)

Load Save 2

If you are successful, you will see some Pink coloured flowers on the ground

.
If you are unlucky and see no Pink flowers formed, load Save 1 and repeat the steps until you get your Pink flowers





7. MULTIPLYING THE FLOWERS (PINK)

Repeat (Part 5 from the previous section) but now with Pink flowers, you should have at least 6 Pink flowers by the end of this step

8. GETTING WHITE FLOWERS (LUNAR TEARS)

Plant Peach flowers in the following order:

PEACH EMPTY PEACH EMPTY PEACH
PEACH EMPTY PEACH EMPTY PEACH
PEACH EMPTY PEACH EMPTY PEACH

Keep a save file of with the garden in this arrangement (Save 1) (You can now override any saves from the previous step)

After you have made the save, plant the Pink flowers in the Empty Slots. Your garden should look like this

PEACH PINK PEACH PINK PEACH
PEACH PINK PEACH PINK PEACH
PEACH PINK PEACH PINK PEACH

Make a save this the garden in this arrangement (Save 2) (DO NOT override Save 1)

Forward the time on your PC by two days (NO need to exit your game)

Load Save 2

If you are successful, you will see some White coloured flowers on the ground




If you are unlucky and see no White flowers formed, load Save 1 and repeat the steps until you get your White flowers





8. (OPTIONAL) MULTIPLY THE FLOWERS (WHITE) (ALERT: Different from other steps)

Plants all the White seeds you have and water them

Save

Forward the time on your PC by five hours (NO need to exit your game)

Load the save

Water the plants

Save (can override the previous save)

Forward the time on your PC by two days (NO need to exit your game)

Load the save and by now you should have more white flowers seeds

NOTE:
1) If you want the flowers and not the seeds, fast forwards by one day only






9. Congratulate yourself getting the achievements

Changelog and special thanks

27/04/21:
Fixed some minor grammar and English

28/04/21:
Divided the long Procedure to smaller sections for ease of navigation.
Quitting game before loading save is removed.
White flowers (Lunar Tears) now requires 5 hours before it can be watered again
(Thanks Azure Fang for contributing almost entirely to this change)

05/05/21:
The order which flowers must surrounded which flowers is no longer important
Thanks LionOfComarre for contributing to this change

If you see any error in the guide or any confusing sentences or expressions (English is not my first language), please inform me

Thanks for reading my guides and have a nice day ahead <3