This event has a special type of buff:
Conditional Buffs. These are activated by first fulfilling certain conditions, and stay in effect so long as the conditions remain met, only stopping when you fail to maintain the condition. First, though, let's take a look at the main buff that you'll need to use in order to achieve these special objectives:
Name: Flower Bouquet
Effect: Activates heartily buff effect
Target: Population building
Duration: 3 hours (22 hours on friend/guild members)
Price: 4 Flowers
Flower Bouquets can be made in your Provision House and Rarity Provision House by using Flowers. On their own, they provide a pretty love-filled buff effect on population buildings, but don't let that fool you into thinking they're just shiny fluff! If you have a certain amount of these buffs running concurrently on your home island, you'll gain access to powerful zone-wide effects:
Name: Heart Lockets
Effect: +200% population growth
Targets: Mayor's House, Village School, University
Condition: Five (5) active Flower Bouquet buffs
Name: Family Day
Effect: +200% recruitment speed
Targets: Barracks, Elite Barracks
Condition: Ten (10) active Flower Bouquet buffs
Valentine Cards are another precursor buff that can be used to create lucrative effects:
Name: Buddy's Valentine Card Box
Effect: Rewards one of the Valentine Cards randomly
Production Time: 36 hours (Provision House), 6 hours (Rarity Provision House)
Cost: 4,400 Pinewood Planks, 780 Simple Paper, 660 Nibs
Upon making Buddy's Valentine Card Box, you'll be rewarded with one of 9 Valentine Cards, picked at random:
Name: Valentine Card
Effect: +300% Flower Farm production
Target: Flower Farms
Duration: 1 hour (3 hours on friend/guild members)
At face value, these appear as short but powerful buffs to your Flower Farm production, but something special happens when all three of your Flower Farms are buffed at the same time:
Name: Valentine
Effect: +200% to resources, refiller, and XP!
Targets: Completed Co-op & Multiplayer adventures
Condition: Three (3) active Valentine Card buffs
As long as this conditional buff is active, the owner will be able to take advantage of increased loot from their cooperative adventures, including Flower Refills! So be sure to spread the love, and reap even more rewards while you tackle some group content! A zone-wide adventure loot boost buff is triggered once valentine card buffs are running on all three flower farms simultaneously. The zone-wide buff is stopped when the amount of simultaneously running valentine card buffs is below 3.
Premium Boost: The +50% premium boost is applied after the initial reward boost.
Example:
100% (Base) + 200% (Valentine Buff) = 300% Overall Reward
Overall Reward (300%) * 1,5 (Premium) = 450%
Name: Recipe: Normal Star Chart
Name: Recipe: Detailed Star Chart
Name: Hugs & Kisses
Name: Love-crazed
Name: Celebration of Love
Name: Flower Rain
Name: Bottled Innocence
Name: Grout
Name: Fertilizer: Flower Farm
Name: Small Flower Package
Name: Large Flower Package
Name: Barrel of Oil
Name: Specialists Bundle (not tradable, not giftable)
Name: Wonderous Bundle (not tradable, not giftable)
Name: Military Bundle (not tradable, not giftable)
Name: Proof of Love (not tradable, not giftable)
Type: Provisioner, recurring
Type: Hybrid population building, recurring
Description: A high vantage point that allows rangers to take care of the local fauna.
Description: Overcrowded at home? No more room to hoard stuff you never use? We've got you covered. Build your own new storage offshore! Increases storage by 60000. Cannot be used to claim sectors. Cannot be used as a resource drop-off point. Only placeable on water. Size: 2x2.
Description: A star has fallen from the sky. It is made of pure crystal!
Type: Provisioner, recurring
Type: Public, recurring
Name: The Love Garden (Limit: 2)
Name: Observatory (Limit: 
Name: Weather Station (Limit: 
The Scouting Post
Name: Loner General (Limit: 3 per Event)
Name: Romantic Explorer (Limit: 3 per Event)
Name: Keener Explorer (Limit: 3 per Event)
Name: Quartermaster Bigheart (Limit: 3 per Event)
Name: Charming Geologist (Limit: 2 per Event)
Name: Lovely Explorer (Limit: 2 per Event)
Type: Regular door
Type: Special door