After much testing this is what I believe to be is the most consistent freeze deck for Rose.
The thing I've discovered and is interesting about the mulligan process is that in the early game players will give rose respect and not play a zombie for fear of the freeze combo
this is what we take advantage of and keeping 3 drops like Rescue Radish and Vanilla are all pretty viable. The beauty of Rescue Radish is that
its great on turn 3 when you have no plants and later on we could bounce back our "When played" cards like Chilly Pepper, Brainana, and The Greaat Zucchini. However, if we have freezing in our hand or snow drop we obviously want to keep that.
Against Gravestone decks Snow pea is a good keep to combat the inevitable Swashbuckler, against crazy decks water balloons are a good keep to kill off low health minions, and snapdragon could be a good keep
to combat zombie heroes without nibble or plumber. These are all very good situational keeps but remember our top priority is freezing, and stalling for our late game finisheres. Most games with this deck will
go to the late game and that's where we rely on our Great Zucchini or Cornucopia to finish the game. Don't underestimate snowdrop however, it very well could be our win condition along with Power Flower if our opponent has no removal in hand
but snowdrop is more of a distraction for our opponent that they have to deal with in the meanwhile before we get to the late game.
At first glance, this deck looks similar to PvZTryHard's "Freeze Rose" deck. However, the way you use this deck is different from that deck. For your information, I tested this a lot on ranked in the early diamond league. It has fared kinda well. To use this deck effectively, you need to keep either your snowdrops and/or your mayflowers alive. Depending on your play style, you might want to either freeze zombies to buff your snowdrops and play mayflowers as a distraction or vice versa. Here's the list of each plant and their purpose in this deck. (As to why I call this version 1, I didn't have winter melon as when I made this card deck but this deck works surprisingly well. If I do add that plant, it may disrupt the deck synergy so it must have its own deck)
Iceberg Lettuce (Used to buff snowdrops and to destroy zombies if a winter squash is currently in play.)
Snowdrop (One of your two crucial plants in this deck)
Snow Pea (An early way to freeze zombies. Also very cheap)
Water Balloons (Well, stat reduction of zombies never hurt plant hero)
Chilly Pepper (like Iceberg Lettuce but you can also defend a lane)
Mayflower (Your other crucial plant. She is going to supply you with extra cards and can also distract the zombie hero)
Spring Bean (A nice way to wipe clean those buffs that zombie earned)
Whack-a-Zombie (You need this to eliminate weak strength zombies. They may cause your downfall if you don't bring this)
Carrotillery (Huge damage giver)
Lawnmower (A cheaper squash that works only on ground lanes)
Winter Squash (A nice way to kill zombies anywhere for just 1 sun, Iceberg Lettuce. He can tank a few hits so he can last a few turns before dying unless he gets hit by deadly)
Squash (Use this if you don't have any other instant-kill options)